Pub Date : 2025-02-01DOI: 10.1016/j.ijleo.2024.172168
Hun-Kook Choi , Young-Jun Jung , Bong-Ahn Yu , Yeung Lak Lee , Young-Chul Noh , Ik-Bu Sohn
We employed two fabrication methods, a laser scanning system and a phase mask, to produce Fiber Bragg Gratings (FBGs). A micro-scanning adapter was used to enable high-speed and high-resolution laser focusing inside the optical fiber via a scanner and an objective lens. By continuously moving the fiber-fixed stage while adjusting the scanner repetition speed, micropatterns with various periods were generated. This approach allowed for the detection of FBG signals at multiple wavelengths. Laser direct writing, utilizing a high-speed and high-resolution laser scanning system, facilitated FBG production without the need to remove the fiber coating. This method provided a straightforward way to control the FBG wavelength, signal intensity, and bandwidth by adjusting the scanner and stage movement speeds. The use of femtosecond lasers for FBG fabrication offers the additional advantage of reduced material dependence, enabling FBG production in various optical fibers without requiring additional processing steps compared to conventional methods.
{"title":"Femtosecond laser direct writing of Fiber Bragg Grating with high-speed and high-resolution scanning technique","authors":"Hun-Kook Choi , Young-Jun Jung , Bong-Ahn Yu , Yeung Lak Lee , Young-Chul Noh , Ik-Bu Sohn","doi":"10.1016/j.ijleo.2024.172168","DOIUrl":"10.1016/j.ijleo.2024.172168","url":null,"abstract":"<div><div>We employed two fabrication methods, a laser scanning system and a phase mask, to produce Fiber Bragg Gratings (FBGs). A micro-scanning adapter was used to enable high-speed and high-resolution laser focusing inside the optical fiber via a scanner and an objective lens. By continuously moving the fiber-fixed stage while adjusting the scanner repetition speed, micropatterns with various periods were generated. This approach allowed for the detection of FBG signals at multiple wavelengths. Laser direct writing, utilizing a high-speed and high-resolution laser scanning system, facilitated FBG production without the need to remove the fiber coating. This method provided a straightforward way to control the FBG wavelength, signal intensity, and bandwidth by adjusting the scanner and stage movement speeds. The use of femtosecond lasers for FBG fabrication offers the additional advantage of reduced material dependence, enabling FBG production in various optical fibers without requiring additional processing steps compared to conventional methods.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"321 ","pages":"Article 172168"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-30DOI: 10.1016/j.ijleo.2025.172235
Erqi Yang , Wanpeng Tang , Qiujun Deng
The demand for transparent conducting oxides (TCOs) with enhanced near-infrared (NIR) transparency has intensified, driven by advancements in optoelectronics that require materials balancing optical clarity and conductivity across broader spectra. While substantial research has elucidated the foundational properties of TCOs, the impact of electronic characteristics particularly carrier mobility and concentration on NIR performance remains underexplored. This study employs a numerical approach to systematically analyze how electronic parameters govern TCOs optical properties, with a focus on NIR transparency. Findings indicate that increasing carrier mobility extends NIR transparency by shifting the transmittance cutoff, while variations in concentration and material thickness profoundly affect reflectance and absorbance within the NIR spectrum. For optimal NIR transparency, the study suggests a carrier concentration of approximately 2 × 1020 cm−3, film thickness of 200 nm, and enhanced carrier mobility exceeding 100 cm2/V s. The result underscore the potential of electronic tuning to refine TCO properties, offering valuable guidance for developing TCOs with enhanced performance across both visible and NIR ranges, tailored for next-generation optoelectronic applications.
{"title":"Electronic parameters impact on near-infrared optical properties in transparent conducting oxides","authors":"Erqi Yang , Wanpeng Tang , Qiujun Deng","doi":"10.1016/j.ijleo.2025.172235","DOIUrl":"10.1016/j.ijleo.2025.172235","url":null,"abstract":"<div><div>The demand for transparent conducting oxides (TCOs) with enhanced near-infrared (NIR) transparency has intensified, driven by advancements in optoelectronics that require materials balancing optical clarity and conductivity across broader spectra. While substantial research has elucidated the foundational properties of TCOs, the impact of electronic characteristics particularly carrier mobility and concentration on NIR performance remains underexplored. This study employs a numerical approach to systematically analyze how electronic parameters govern TCOs optical properties, with a focus on NIR transparency. Findings indicate that increasing carrier mobility extends NIR transparency by shifting the transmittance cutoff, while variations in concentration and material thickness profoundly affect reflectance and absorbance within the NIR spectrum. For optimal NIR transparency, the study suggests a carrier concentration of approximately 2 × 10<sup>20</sup> cm<sup>−3</sup>, film thickness of 200 nm, and enhanced carrier mobility exceeding 100 cm<sup>2</sup>/V s. The result underscore the potential of electronic tuning to refine TCO properties, offering valuable guidance for developing TCOs with enhanced performance across both visible and NIR ranges, tailored for next-generation optoelectronic applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"325 ","pages":"Article 172235"},"PeriodicalIF":3.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-27DOI: 10.1016/j.ijleo.2025.172234
Xiaofeng Wang , Shuqin Zhai , Xiaoling Li , Kui Liu
Entanglement swapping, a crucial technique for establishing a global quantum network, enables independent quantum states to become entangled without direct interaction. This remarkable technique can also be effectively applied to Einstein-Podolsky-Rosen (EPR) steering swapping. EPR steering, which is a kind of quantum correlation between entanglement and Bell nonlocality, is considered as a valuable resource for secure quantum communication. However, in practical applications, quantum states often need to be transmitted over long distances before entanglement or steering swapping. Unfortunately, unavoidable loss and noise will degrade the correlation characteristics of quantum states. As a result, it may become difficult to generate steering after steering swapping. In this paper, we propose the application of noiseless linear amplification (NLA) technology to the EPR steering swapping for the first time. We theoretically analyze the effects of NLA on steering swapping. Results indicate that NLA can change the original channel optimal gain, effectively expand the range of achievable channel gain and the transmission distance. It can also tolerate higher levels of excess noise, and improve the steerability of quantum states. Steering swapping has important applications in building wide area quantum communication networks, thus paving the way for the establishment of reliable and efficient global quantum networks.
{"title":"Noiseless linear amplification for Einstein-Podolsky-Rosen steering swapping","authors":"Xiaofeng Wang , Shuqin Zhai , Xiaoling Li , Kui Liu","doi":"10.1016/j.ijleo.2025.172234","DOIUrl":"10.1016/j.ijleo.2025.172234","url":null,"abstract":"<div><div>Entanglement swapping, a crucial technique for establishing a global quantum network, enables independent quantum states to become entangled without direct interaction. This remarkable technique can also be effectively applied to Einstein-Podolsky-Rosen (EPR) steering swapping. EPR steering, which is a kind of quantum correlation between entanglement and Bell nonlocality, is considered as a valuable resource for secure quantum communication. However, in practical applications, quantum states often need to be transmitted over long distances before entanglement or steering swapping. Unfortunately, unavoidable loss and noise will degrade the correlation characteristics of quantum states. As a result, it may become difficult to generate steering after steering swapping. In this paper, we propose the application of noiseless linear amplification (NLA) technology to the EPR steering swapping for the first time. We theoretically analyze the effects of NLA on steering swapping. Results indicate that NLA can change the original channel optimal gain, effectively expand the range of achievable channel gain and the transmission distance. It can also tolerate higher levels of excess noise, and improve the steerability of quantum states. Steering swapping has important applications in building wide area quantum communication networks, thus paving the way for the establishment of reliable and efficient global quantum networks.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"324 ","pages":"Article 172234"},"PeriodicalIF":3.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-26DOI: 10.1016/j.ijleo.2025.172233
Lóránt Tibor Csőke , Florian Seier , Zsolt Kollár
This paper presents the design and implementation of a tailored hyperspectral readout system for rapid characterization of transmission-based localized surface plasmon resonance (LSPR) biosensors. It addresses a gap in plasmonic research by offering high flexibility in experimenting with both chip synthesis and readout methodologies. The findings reported in this article can support the development of multiplexed LSPR array sensors with high sensitivity (120 nm/RIU), compact size (2 × 3 mm), and fast readout speed by providing optimal synthesis parameters, such as nanoparticle density and size, along with a robust foundation for designing an appropriate optical readout system. The setup incorporates a digitally controlled monochromator, offering high versatility in experimenting with the illumination’s wavelength, resolution and bandwidth. By employing a laser-excited phosphor source, integration times of the detector can be significantly reduced compared to Tungsten-Halogen light sources, resulting in enhanced signal-to-noise ratio and measurement time. Through a fully automated software-driven setup, the process of determining optimal chip design parameters, such as the density of nanoparticles and the size of the sensing spots, is streamlined. Additionally, simultaneous capture of illumination spectra is achieved for every measurement via a reference optical path with a spectrometer to mitigate measurement errors induced by source wavelength drift. Furthermore, the system facilitates straightforward detection of manufacturing errors, including misalignment or inhomogeneous particle distributions, enhancing overall efficiency and reliability for evaluating biosensors.
{"title":"Custom optical system for enhanced characterization and analysis of LSPR-based biosensors","authors":"Lóránt Tibor Csőke , Florian Seier , Zsolt Kollár","doi":"10.1016/j.ijleo.2025.172233","DOIUrl":"10.1016/j.ijleo.2025.172233","url":null,"abstract":"<div><div>This paper presents the design and implementation of a tailored hyperspectral readout system for rapid characterization of transmission-based localized surface plasmon resonance (LSPR) biosensors. It addresses a gap in plasmonic research by offering high flexibility in experimenting with both chip synthesis and readout methodologies. The findings reported in this article can support the development of multiplexed LSPR array sensors with high sensitivity (120 nm/RIU), compact size (2 × 3 mm), and fast readout speed by providing optimal synthesis parameters, such as nanoparticle density and size, along with a robust foundation for designing an appropriate optical readout system. The setup incorporates a digitally controlled monochromator, offering high versatility in experimenting with the illumination’s wavelength, resolution and bandwidth. By employing a laser-excited phosphor source, integration times of the detector can be significantly reduced compared to Tungsten-Halogen light sources, resulting in enhanced signal-to-noise ratio and measurement time. Through a fully automated software-driven setup, the process of determining optimal chip design parameters, such as the density of nanoparticles and the size of the sensing spots, is streamlined. Additionally, simultaneous capture of illumination spectra is achieved for every measurement via a reference optical path with a spectrometer to mitigate measurement errors induced by source wavelength drift. Furthermore, the system facilitates straightforward detection of manufacturing errors, including misalignment or inhomogeneous particle distributions, enhancing overall efficiency and reliability for evaluating biosensors.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"324 ","pages":"Article 172233"},"PeriodicalIF":3.1,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-25DOI: 10.1016/j.ijleo.2025.172236
Gustavo F. Arenas , Juan Daniel Madrigal , Mauro Difeo , Martin Lere , Nicolás Pérez , Javier E. Camargo , Miriam S. Castro , Federico J. Cavalieri , Leandro A. Ramajo
This study presents an interferometric methodology to determine the dynamic piezoelectric coefficient () of lead-free piezoelectric ceramics. Using a fiber optic Fizeau interferometer, we analyze the (K₀.₄₄Na₀.₅₂Li₀.₀₄)(Nb₀.₈₆Ta₀.₁₀Sb₀.₀₄)O₃ (KNL-NTS) composition, an eco-friendly alternative to traditional lead-based materials. The displacement of the ceramic samples under a varying electric field was measured, allowing the dynamic strain-time curve to be obtained and analyzed. This temporal displacement analysis reveals the material's real-time electromechanical response, providing insights into its behavior under dynamic excitation. The interferometric method demonstrates advantages such as non-invasive measurement, self-calibration, and accurate determination of . The dynamic piezoelectric coefficient was measured to be around 840 pm/V, with results validated using the resonance frequency method.
{"title":"Determination of the piezoelectric coefficient in lead-free ceramics via Fizeau fiber optic interferometry","authors":"Gustavo F. Arenas , Juan Daniel Madrigal , Mauro Difeo , Martin Lere , Nicolás Pérez , Javier E. Camargo , Miriam S. Castro , Federico J. Cavalieri , Leandro A. Ramajo","doi":"10.1016/j.ijleo.2025.172236","DOIUrl":"10.1016/j.ijleo.2025.172236","url":null,"abstract":"<div><div>This study presents an interferometric methodology to determine the dynamic piezoelectric coefficient (<span><math><mrow><msubsup><mrow><mi>d</mi></mrow><mrow><mn>33</mn></mrow><mrow><mo>*</mo></mrow></msubsup></mrow></math></span>) of lead-free piezoelectric ceramics. Using a fiber optic <em>Fizeau</em> interferometer, we analyze the (K₀.₄₄Na₀.₅₂Li₀.₀₄)(Nb₀.₈₆Ta₀.₁₀Sb₀.₀₄)O₃ (KNL-NTS) composition, an eco-friendly alternative to traditional lead-based materials. The displacement of the ceramic samples under a varying electric field was measured, allowing the dynamic strain-time curve to be obtained and analyzed. This temporal displacement analysis reveals the material's real-time electromechanical response, providing insights into its behavior under dynamic excitation. The interferometric method demonstrates advantages such as non-invasive measurement, self-calibration, and accurate determination of <span><math><mrow><msubsup><mrow><mi>d</mi></mrow><mrow><mn>33</mn></mrow><mrow><mo>*</mo></mrow></msubsup></mrow></math></span>. The dynamic piezoelectric coefficient was measured to be around 840 pm/V, with results validated using the resonance frequency method.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"324 ","pages":"Article 172236"},"PeriodicalIF":3.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-25DOI: 10.1016/j.ijleo.2025.172237
Amna Khatoon , Junaid Ali Syed , Amber R. Solangi , Arfana Mallah , Sirajuddin
The presence of hazardous mercury ions (Hg2+) in industrial waste not only contaminates water reservoirs but also influence badly on human skin if its amount exceeds the allowed limit in cosmetics. It is still very challenging to develop a selective and sensitive Hg2+ sensor to protect environment as well as human health. In this work, we demonstrated a robust and facile synthesis for the development of silver nanoparticles (AgNPs) from Capsicum annumm C. (CA) extract as bio-reductant and stabilizer. Different experimental parameters were optimized i.e., effect of volume, pH and heating time via UV-Vis spectrophotometer to achieve the stable CA-AgNPs. The phytochemical bio-functionality, crystallinity and size controlled CA-AgNPs with prominent blue shifted surface plasmon resonance (SPR) band at 396 nm with golden yellow color were obtained. The size of the fabricated CA-AgNPs was reported an average of approximately 11–22 nm of spherical shape which act as a selective and sensitive conventional colorimetric sensor probe. The sensor efficiently respond as decrease in color and SPR band with blue shift due to Hg2+ ions detection even under the interference of other ions. The CA-AgNPs sensor displays an outstanding linear calibration response with increase in Hg2+ ions concentration range from 1 to 10 µM and lowest LOD of 0.17 µM with satisfactory percentage recoveries from 96 % to 98.5 %. The mechanism of Hg2+ ions detection were described on the basis of change in hydrodynamic size and zeta potential of the CA-AgNPs with time from 0 to 30 minutes of interaction.
{"title":"Mechanistic insights of mercury ion detection and its influence on time monitored hydrodynamic size of Capsicum Annumm C derived silver nanoparticles during colorimetric nano-sensing","authors":"Amna Khatoon , Junaid Ali Syed , Amber R. Solangi , Arfana Mallah , Sirajuddin","doi":"10.1016/j.ijleo.2025.172237","DOIUrl":"10.1016/j.ijleo.2025.172237","url":null,"abstract":"<div><div>The presence of hazardous mercury ions (Hg<sup>2+</sup>) in industrial waste not only contaminates water reservoirs but also influence badly on human skin if its amount exceeds the allowed limit in cosmetics. It is still very challenging to develop a selective and sensitive Hg<sup>2+</sup> sensor to protect environment as well as human health. In this work, we demonstrated a robust and facile synthesis for the development of silver nanoparticles (AgNPs) from <em>Capsicum annumm C</em>. (CA) extract as bio-reductant and stabilizer. Different experimental parameters were optimized i.e., effect of volume, pH and heating time via UV-Vis spectrophotometer to achieve the stable CA-AgNPs. The phytochemical bio-functionality, crystallinity and size controlled CA-AgNPs with prominent blue shifted surface plasmon resonance (SPR) band at 396 nm with golden yellow color were obtained. The size of the fabricated CA-AgNPs was reported an average of approximately 11–22 nm of spherical shape which act as a selective and sensitive conventional colorimetric sensor probe. The sensor efficiently respond as decrease in color and SPR band with blue shift due to Hg<sup>2+</sup> ions detection even under the interference of other ions. The CA-AgNPs sensor displays an outstanding linear calibration response with increase in Hg<sup>2+</sup> ions concentration range from 1 to 10 µM and lowest LOD of 0.17 µM with satisfactory percentage recoveries from 96 % to 98.5 %. The mechanism of Hg<sup>2+</sup> ions detection were described on the basis of change in hydrodynamic size and zeta potential of the CA-AgNPs with time from 0 to 30 minutes of interaction.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"325 ","pages":"Article 172237"},"PeriodicalIF":3.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143132930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-22DOI: 10.1016/j.ijleo.2025.172232
Baljinder Singh Heera, Yatindra Nath Singh
A K-Hybrid Paths-based Routing, Modulation, and Spectrum Assignment (RMSA) algorithm is proposed for Elastic Optical Networks (EONs). Simulation experiments on realistic network topologies evaluate the algorithm’s performance. Results confirm that the proposed K-Hyb-RMSA algorithm significantly reduces connection blocking under both low and high traffic loads compared to benchmarks such as Shortest Path-RMSA, K-Shortest Paths-RMSA, K-Disjoint Paths RMSA, and Load-Balancing-RMSA algorithms. Moreover, it inherits resilience similar to the K-Disjoint Paths-based RMSA algorithm while maintaining a lower request-blocking probability. Notably, the proposed algorithm does not introduce additional service provisioning delays observed with state-of-the-art load-balancing RMSA algorithms.
{"title":"Hybrid routing based RMSA algorithm for service delay aware applications in elastic optical networks","authors":"Baljinder Singh Heera, Yatindra Nath Singh","doi":"10.1016/j.ijleo.2025.172232","DOIUrl":"10.1016/j.ijleo.2025.172232","url":null,"abstract":"<div><div>A K-Hybrid Paths-based Routing, Modulation, and Spectrum Assignment (RMSA) algorithm is proposed for Elastic Optical Networks (EONs). Simulation experiments on realistic network topologies evaluate the algorithm’s performance. Results confirm that the proposed K-Hyb-RMSA algorithm significantly reduces connection blocking under both low and high traffic loads compared to benchmarks such as Shortest Path-RMSA, K-Shortest Paths-RMSA, K-Disjoint Paths RMSA, and Load-Balancing-RMSA algorithms. Moreover, it inherits resilience similar to the K-Disjoint Paths-based RMSA algorithm while maintaining a lower request-blocking probability. Notably, the proposed algorithm does not introduce additional service provisioning delays observed with state-of-the-art load-balancing RMSA algorithms.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"324 ","pages":"Article 172232"},"PeriodicalIF":3.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-22DOI: 10.1016/j.ijleo.2025.172229
M. Hbibi , S. Chouef , R. Boussetta , A. El Moussaouy , O. Mommadi , F. Falyouni , C.A. Duque
We have examined the optical characteristics of an exciton trapped in a multilayer cylindrical quantum dot, taking into account the impact of external perturbations and finite barrier confinement potentials. We compute the emission wavelength, oscillator strength, binding energy, exciton radiative lifetime, and interband transition energy (photoluminescence). Together with the effective mass approximation, a variational approach is used to calculate these energies. Furthermore, we investigate the impact of first barrier material concentration and geometric parameters like core radius and height. We also investigate how temperature and pressure affect opto-excitonic characteristics, both with and without strain effects. Our results show that the geometrical parameters influence not only the ground-state binding energy and the interband transition energy, but also affect the oscillator strength and the radiative lifetime. The application of pressure increases the exciton binding energy, radiative lifetime and interband transition energy, while reducing the oscillator strength and emission wavelength. We also demonstrate that deformation significantly modifies the edges of the conduction and valence bands.
{"title":"Controlled exciton properties in UV light-emitting devices using multilayer cylindrical quantum dots: Improvement through hydrostatic pressure, temperature and strain effects","authors":"M. Hbibi , S. Chouef , R. Boussetta , A. El Moussaouy , O. Mommadi , F. Falyouni , C.A. Duque","doi":"10.1016/j.ijleo.2025.172229","DOIUrl":"10.1016/j.ijleo.2025.172229","url":null,"abstract":"<div><div>We have examined the optical characteristics of an exciton trapped in a multilayer cylindrical quantum dot, taking into account the impact of external perturbations and finite barrier confinement potentials. We compute the emission wavelength, oscillator strength, binding energy, exciton radiative lifetime, and interband transition energy (photoluminescence). Together with the effective mass approximation, a variational approach is used to calculate these energies. Furthermore, we investigate the impact of first barrier material concentration and geometric parameters like core radius and height. We also investigate how temperature and pressure affect opto-excitonic characteristics, both with and without strain effects. Our results show that the geometrical parameters influence not only the ground-state binding energy and the interband transition energy, but also affect the oscillator strength and the radiative lifetime. The application of pressure increases the exciton binding energy, radiative lifetime and interband transition energy, while reducing the oscillator strength and emission wavelength. We also demonstrate that deformation significantly modifies the edges of the conduction and valence bands.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"324 ","pages":"Article 172229"},"PeriodicalIF":3.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A D-type photonic crystal fiber optic temperature sensor incorporating a gold nanowire was developed. The design and optimization process utilized the finite element method to refine key sensor parameters, including the diameter of the air holes within the fiber, the dimensions of the gold nanowires, and the spacing between the air holes. Through this optimization, the optimal structural parameters were determined. The temperature sensing properties of the sensor were investigated, demonstrating a sensing capability within the range of 10–50 °C, achieving a maximum sensitivity of −19.0 nm/°C. The sensor exhibits notable performance, characterized by a straightforward structural design and a fabrication process of relatively low complexity, highlighting its strong potential for applications in temperature sensing technology.
{"title":"Research on D-shape PCF temperature sensor with simple structure and high sensitivity","authors":"Qiunan Zhang , Zhao Zhang , Can’er Cheng, Chuanyang Huang, Xiangyu Liao, Jian Tang, Junhui Hu, Yongmei Wang, Weijia Shao","doi":"10.1016/j.ijleo.2025.172228","DOIUrl":"10.1016/j.ijleo.2025.172228","url":null,"abstract":"<div><div>A D-type photonic crystal fiber optic temperature sensor incorporating a gold nanowire was developed. The design and optimization process utilized the finite element method to refine key sensor parameters, including the diameter of the air holes within the fiber, the dimensions of the gold nanowires, and the spacing between the air holes. Through this optimization, the optimal structural parameters were determined. The temperature sensing properties of the sensor were investigated, demonstrating a sensing capability within the range of 10–50 °C, achieving a maximum sensitivity of −19.0 nm/°C. The sensor exhibits notable performance, characterized by a straightforward structural design and a fabrication process of relatively low complexity, highlighting its strong potential for applications in temperature sensing technology.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"323 ","pages":"Article 172228"},"PeriodicalIF":3.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, for the first time, exact analytical expressions for determination of the wavelength of defect modes (DMs) in one-dimensional (1D) photonic crystals (PCs) with two defect layers (DLs) have been obtained from the condition of total transmittance. In contrast to the approximate expressions derived earlier by other authors, exact analytical solutions depending on the reflection coefficients of the PC mirrors have been found. These equations are also an alternative to a more direct calculation of the DM wavelengths via reflection or transmission spectra of the whole structure. The main difference from this method is that the conventional method requires finding the DMs at the particular DL thicknesses while our method allows calculation of the necessary DL thicknesses for any desired DM wavelength. Also, analytical condition for the DM merging in PC with two DLs has been derived for the first time. Furthermore, the results obtained previously by other researchers concerning the merging of DMs as the number of layers in the central part of a PC with two DLs increases have been summarized and explained. Moreover, the analytical condition of the maximum amplitude of DMs was obtained for the first time. The results of this research permit the simplification of the analysis of optical sensors and filters based on 1D PCs with two DLs, as well as a more comprehensive understanding of the DM behavior within the PBGs of such structures. Such defected PCs have a variety of potential practical applications including lasers, sensors, filters and more.
{"title":"One-dimensional photonic crystals with two defects: An analytical approach","authors":"A.O. Kamenev , N.A. Vanyushkin , I.M. Efimov , A.H. Gevorgyan","doi":"10.1016/j.ijleo.2025.172231","DOIUrl":"10.1016/j.ijleo.2025.172231","url":null,"abstract":"<div><div>In this paper, for the first time, exact analytical expressions for determination of the wavelength of defect modes (DMs) in one-dimensional (1D) photonic crystals (PCs) with two defect layers (DLs) have been obtained from the condition of total transmittance. In contrast to the approximate expressions derived earlier by other authors, exact analytical solutions depending on the reflection coefficients of the PC mirrors have been found. These equations are also an alternative to a more direct calculation of the DM wavelengths via reflection or transmission spectra of the whole structure. The main difference from this method is that the conventional method requires finding the DMs at the particular DL thicknesses while our method allows calculation of the necessary DL thicknesses for any desired DM wavelength. Also, analytical condition for the DM merging in PC with two DLs has been derived for the first time. Furthermore, the results obtained previously by other researchers concerning the merging of DMs as the number of layers in the central part of a PC with two DLs increases have been summarized and explained. Moreover, the analytical condition of the maximum amplitude of DMs was obtained for the first time. The results of this research permit the simplification of the analysis of optical sensors and filters based on 1D PCs with two DLs, as well as a more comprehensive understanding of the DM behavior within the PBGs of such structures. Such defected PCs have a variety of potential practical applications including lasers, sensors, filters and more.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"323 ","pages":"Article 172231"},"PeriodicalIF":3.1,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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