Pub Date : 2024-09-18DOI: 10.1088/2040-8986/ad7964
Isaac Zachmann, Qirui Zhang, Anastasiia Svanidze, Lianhua Ji and Chongchang Mao
Phase-only liquid crystal on silicon (LCoS) spatial light modulators are used in a variety of applications. Despite their wide use, current phase-only LCoS devices are hindered by their single-polarization modulation. We propose a polarization independent LCoS device which uses a polymer quarter-wave plate for polarization conversion. We designed a custom pixel circuit which enables high driving voltage and high pixel grayscale by utilizing an analog driving frame buffer pixel circuit. Our pixel circuit is optimized for small pixel size and the silicon backplanes can be fabricated at a traditional foundry. We demonstrate polarization independent phase modulation through optical beam steering tests for various input polarizations. Our fabricated device lays the foundation for commercial LCoS devices highly suitable for wavelength selective switches, holographic display, wavefront correction, and optical beam shaping.
{"title":"Design and fabrication of polarization independent LCoS phase modulators with polymer waveplate and analog driving","authors":"Isaac Zachmann, Qirui Zhang, Anastasiia Svanidze, Lianhua Ji and Chongchang Mao","doi":"10.1088/2040-8986/ad7964","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7964","url":null,"abstract":"Phase-only liquid crystal on silicon (LCoS) spatial light modulators are used in a variety of applications. Despite their wide use, current phase-only LCoS devices are hindered by their single-polarization modulation. We propose a polarization independent LCoS device which uses a polymer quarter-wave plate for polarization conversion. We designed a custom pixel circuit which enables high driving voltage and high pixel grayscale by utilizing an analog driving frame buffer pixel circuit. Our pixel circuit is optimized for small pixel size and the silicon backplanes can be fabricated at a traditional foundry. We demonstrate polarization independent phase modulation through optical beam steering tests for various input polarizations. Our fabricated device lays the foundation for commercial LCoS devices highly suitable for wavelength selective switches, holographic display, wavefront correction, and optical beam shaping.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"21 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-18DOI: 10.1088/2040-8986/ad77e3
Sergei V Anishchik and Marcos Dantus
A widefield microscope based on a Linnik interferometer was designed, constructed, and tested. The phase-shifting and polarized single-shot methods were used to measure interference patterns. Both methods use a low-coherence light-emitting diode as the light source, achieving a resolution of 10 nm in the Z direction and diffraction-limited resolution in the X and Y directions. The single-shot method is vibration-insensitive, allowing for the observation of moving objects. The simplicity and low cost of this instrument make it valuable for a wide range of applications.
设计、制造并测试了基于林尼克干涉仪的宽场显微镜。采用移相法和偏振单光法测量干涉图案。这两种方法都使用低相干性发光二极管作为光源，Z 方向的分辨率达到 10 纳米，X 和 Y 方向的分辨率达到衍射极限。单次拍摄法对振动不敏感，因此可以观测移动物体。该仪器操作简单、成本低廉，因此具有广泛的应用价值。
{"title":"Optical microscope with nanometer longitudinal resolution based on a Linnik interferometer","authors":"Sergei V Anishchik and Marcos Dantus","doi":"10.1088/2040-8986/ad77e3","DOIUrl":"https://doi.org/10.1088/2040-8986/ad77e3","url":null,"abstract":"A widefield microscope based on a Linnik interferometer was designed, constructed, and tested. The phase-shifting and polarized single-shot methods were used to measure interference patterns. Both methods use a low-coherence light-emitting diode as the light source, achieving a resolution of 10 nm in the Z direction and diffraction-limited resolution in the X and Y directions. The single-shot method is vibration-insensitive, allowing for the observation of moving objects. The simplicity and low cost of this instrument make it valuable for a wide range of applications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"10 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-18DOI: 10.1088/2040-8986/ad77e4
Aldo Peña Ramírez, Tingting Zhai, Rafael Salas-Montiel and Víctor Ruiz Cortés
We propose and demonstrate a method for dynamically changing the patterning of the surface plasmon polariton (SPP) excitation over a large area under spatially inhomogeneous polarized illumination. By illuminating a 1D gold grating with shallow rectangular grooves with a spatially structured polarization beam of near-infrared light (780 nm), we selectively excited SPPs on an extended area. The parameters used to fabricate the grating coupler, matched the wave vector of the incident light with that of the SPP to achieve an efficient coupling. The incident wave illuminating the grating is a spatially inhomogeneous polarized beam. We designed local polarization states to control the local excitation of the SPP in order to pattern large areas. For real-time local control of the polarization state of the extended incident beam, we used a setup with a spatial light modulator and quarter-wave plate.
{"title":"Dynamic tailoring large-area surface plasmon polariton excitation","authors":"Aldo Peña Ramírez, Tingting Zhai, Rafael Salas-Montiel and Víctor Ruiz Cortés","doi":"10.1088/2040-8986/ad77e4","DOIUrl":"https://doi.org/10.1088/2040-8986/ad77e4","url":null,"abstract":"We propose and demonstrate a method for dynamically changing the patterning of the surface plasmon polariton (SPP) excitation over a large area under spatially inhomogeneous polarized illumination. By illuminating a 1D gold grating with shallow rectangular grooves with a spatially structured polarization beam of near-infrared light (780 nm), we selectively excited SPPs on an extended area. The parameters used to fabricate the grating coupler, matched the wave vector of the incident light with that of the SPP to achieve an efficient coupling. The incident wave illuminating the grating is a spatially inhomogeneous polarized beam. We designed local polarization states to control the local excitation of the SPP in order to pattern large areas. For real-time local control of the polarization state of the extended incident beam, we used a setup with a spatial light modulator and quarter-wave plate.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"25 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-17DOI: 10.1088/2040-8986/ad7514
M Babiker, K Koksal, V E Lembessis and J Yuan
The availability of coherent sources of higher order Poincaré optical beams have opened up new opportunities for applications such as in the optical trapping of atoms and small particles, the manipulation of chirally-sensitive systems and in improved encoding schemes for broad-bandwidth communications. Here we determine the intrinsic properties of integer order Poincaré Laguerre–Gaussian (LG) modes which have so far neither been evaluated, nor their significance highlighted. The theoretical framework we adopt here is both novel and essential because it emphasises the crucial role played by the normally ignored axial components of the twisted light fields of these modes. We show that the inclusion of the axial field components enables the intrinsic properties of the Poincaré modes, notably their angular momentum, both spin and orbital as well as their helicity and chirality, to be determined. We predict significant enhancements of the intrinsic properties of these modes when compared with those due to the zero order LG modes. In particular, we show that higher order LG Poincaré modes exhibit super-chirality and, significantly so, even in the case of the first order m = 1.
高阶波恩卡莱光束相干源的出现为原子和小粒子的光学捕获、啁啾敏感系统的操纵以及宽带通信编码方案的改进等应用开辟了新的机遇。在这里，我们确定了整数阶的Poincaré Laguerre-Gaussian（LG）模式的内在特性，迄今为止，这些特性既未得到评估，其重要性也未得到强调。我们在此采用的理论框架既新颖又重要，因为它强调了这些模式的扭曲光场中通常被忽略的轴向分量所发挥的关键作用。我们的研究表明，加入轴向场分量可以确定波恩卡莱模式的固有特性，特别是其角动量（包括自旋和轨道）以及螺旋度和手性。我们预测，与零阶 LG 模式相比，这些模式的固有特性会明显增强。特别是，我们发现高阶 LG 波恩卡莱模式表现出超手性，甚至在一阶 m = 1 的情况下也是如此。
{"title":"Intrinsic angular momentum, spin and helicity of higher-order Poincaré modes","authors":"M Babiker, K Koksal, V E Lembessis and J Yuan","doi":"10.1088/2040-8986/ad7514","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7514","url":null,"abstract":"The availability of coherent sources of higher order Poincaré optical beams have opened up new opportunities for applications such as in the optical trapping of atoms and small particles, the manipulation of chirally-sensitive systems and in improved encoding schemes for broad-bandwidth communications. Here we determine the intrinsic properties of integer order Poincaré Laguerre–Gaussian (LG) modes which have so far neither been evaluated, nor their significance highlighted. The theoretical framework we adopt here is both novel and essential because it emphasises the crucial role played by the normally ignored axial components of the twisted light fields of these modes. We show that the inclusion of the axial field components enables the intrinsic properties of the Poincaré modes, notably their angular momentum, both spin and orbital as well as their helicity and chirality, to be determined. We predict significant enhancements of the intrinsic properties of these modes when compared with those due to the zero order LG modes. In particular, we show that higher order LG Poincaré modes exhibit super-chirality and, significantly so, even in the case of the first order m = 1.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-17DOI: 10.1088/2040-8986/ad78e7
Shuo Zhu, Xinrui Lei, Xi Shen, Haifeng Hu, Ni Zhang and Qiwen Zhan
Optical skyrmions are topological quasiparticles with a complex vectorial field structure. Their associated characteristics of ultra-small, ultra-fast and topological protection have great application prospects in high density data storage, light matter interaction and optical communication. At present, the research of optical skyrmions is still in its infancy, where the construction and flexible regulation of different topological textures are current research hotspot. Here, we combine the twist degree of freedom of materials and optical skyrmions. Based on graphene–chiral–graphene multilayers structure, we demonstrate the field mode symmetry and hybridization to form Bloch-type graphene plasmons skyrmion lattice. At the same time, by changing chirality parameter, the Fermi energy of graphene and the phase of incident light, multidimensional control of Bloch-type optical skyrmions can be realized. Our work demonstrated that the properties of materials provide the additional dimensions to regulate the topological states, and the combination of different materials structures provides the possibility for dynamic construction and manipulation of multiple topological states, which is expected to find applications in integrated nanophotonics devices.
{"title":"Multidimensional dynamic control of optical skyrmions in graphene–chiral–graphene multilayers","authors":"Shuo Zhu, Xinrui Lei, Xi Shen, Haifeng Hu, Ni Zhang and Qiwen Zhan","doi":"10.1088/2040-8986/ad78e7","DOIUrl":"https://doi.org/10.1088/2040-8986/ad78e7","url":null,"abstract":"Optical skyrmions are topological quasiparticles with a complex vectorial field structure. Their associated characteristics of ultra-small, ultra-fast and topological protection have great application prospects in high density data storage, light matter interaction and optical communication. At present, the research of optical skyrmions is still in its infancy, where the construction and flexible regulation of different topological textures are current research hotspot. Here, we combine the twist degree of freedom of materials and optical skyrmions. Based on graphene–chiral–graphene multilayers structure, we demonstrate the field mode symmetry and hybridization to form Bloch-type graphene plasmons skyrmion lattice. At the same time, by changing chirality parameter, the Fermi energy of graphene and the phase of incident light, multidimensional control of Bloch-type optical skyrmions can be realized. Our work demonstrated that the properties of materials provide the additional dimensions to regulate the topological states, and the combination of different materials structures provides the possibility for dynamic construction and manipulation of multiple topological states, which is expected to find applications in integrated nanophotonics devices.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"23 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-16DOI: 10.1088/2040-8986/ad7513
Abbas Nasir, Hongze Wang, Xuefeng Liu and Jichuan Xiong
A dark and bright field (BF) imaging technique explored plasmonic phenomena arising from bumps on a gold nanofilm coated on a silica substrate. The study employs dark field (DF) polarization indirect microscopic imaging to investigate the scattering photon state and reveal the spatial distribution characteristics with distinct multipolar features, contrasting with those observed in the BF imaging configuration. Computational simulations utilizing the finite-difference time-domain method were conducted to understand this behaviour further and consider the experimental setup’s impact. The observations of varying multipolar scattering features with changes in the incident angle of the DF illumination suggest that the excitation of plasmonic effects differs for light beams incident at different angles.
{"title":"Dark field photon scattering state measurements from bumps on a gold nanofilm","authors":"Abbas Nasir, Hongze Wang, Xuefeng Liu and Jichuan Xiong","doi":"10.1088/2040-8986/ad7513","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7513","url":null,"abstract":"A dark and bright field (BF) imaging technique explored plasmonic phenomena arising from bumps on a gold nanofilm coated on a silica substrate. The study employs dark field (DF) polarization indirect microscopic imaging to investigate the scattering photon state and reveal the spatial distribution characteristics with distinct multipolar features, contrasting with those observed in the BF imaging configuration. Computational simulations utilizing the finite-difference time-domain method were conducted to understand this behaviour further and consider the experimental setup’s impact. The observations of varying multipolar scattering features with changes in the incident angle of the DF illumination suggest that the excitation of plasmonic effects differs for light beams incident at different angles.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"8 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-16DOI: 10.1088/2040-8986/ad77e2
Harsh Vardhan, Aswathi K Sivarajan, Sakshi, Salla Gangi Reddy and Ravi Kumar
In this paper, we propose an optical asymmetric phase image encryption method in which the vectorial light field is used to encode the data. In transverse plane, the vectorial light field has spatially varying polarization distributions where we are allowed to have a greater number of degrees of freedom. In this scheme, the input image is first phase encoded and then modulated by a phase encrypting key, synthesized from the speckles obtained by the scattering of Hermite–Gaussian beams. The modulated image is further processed using fractional Fourier transform with a specific order (α). A pixel scrambling operator is utilized to increase the randomness to further enhance the security and singular value decomposition approach is employed to add the nonlinearity in the encryption process. Now, the stokes parameters, i.e. S1 and S2 are calculated using the light intensities correspond to different polarizations. S1 is used as the encrypted image for transmission and S2 is reserved as one of the private decryption keys. The robustness of the proposed technique is tested against various existing attacks, such as known plaintext attack, chosen plaintext attack, and contamination attacks. Numerically simulated results validate the effectiveness and efficiency of the proposed method.
{"title":"Optical phase image encryption using stokes parameters and singular value decomposition","authors":"Harsh Vardhan, Aswathi K Sivarajan, Sakshi, Salla Gangi Reddy and Ravi Kumar","doi":"10.1088/2040-8986/ad77e2","DOIUrl":"https://doi.org/10.1088/2040-8986/ad77e2","url":null,"abstract":"In this paper, we propose an optical asymmetric phase image encryption method in which the vectorial light field is used to encode the data. In transverse plane, the vectorial light field has spatially varying polarization distributions where we are allowed to have a greater number of degrees of freedom. In this scheme, the input image is first phase encoded and then modulated by a phase encrypting key, synthesized from the speckles obtained by the scattering of Hermite–Gaussian beams. The modulated image is further processed using fractional Fourier transform with a specific order (α). A pixel scrambling operator is utilized to increase the randomness to further enhance the security and singular value decomposition approach is employed to add the nonlinearity in the encryption process. Now, the stokes parameters, i.e. S1 and S2 are calculated using the light intensities correspond to different polarizations. S1 is used as the encrypted image for transmission and S2 is reserved as one of the private decryption keys. The robustness of the proposed technique is tested against various existing attacks, such as known plaintext attack, chosen plaintext attack, and contamination attacks. Numerically simulated results validate the effectiveness and efficiency of the proposed method.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"38 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-15DOI: 10.1088/2040-8986/ad7516
Rajni Bala, Joyee Ghosh and Vivek Venkataraman
We experimentally generate polarization spectroscopy (error) signals corresponding to the D2-line hyperfine transitions, of 87Rb, and of 85Rb, and show that the strongest error signals correspond to the closed hyperfine transitions (oscillator strength ), and , respectively. We make the generated error signal robust to fluctuations in external parameters by finding optimum values for the vapor cell temperature and pump-probe intensities at two different beam diameters. We further employ these optimized error signals to directly (without the need for frequency/phase modulation) lock the laser frequency—reducing the rms drift/linewidth from MHz to kHz, when measured over a min duration. In addition, by comparing theoretically calculated and experimentally measured error signals for the pump intensities ranging from (where, mW cm−2 is the two-level saturation intensity for the Rb D2-line transitions), we discuss the applicability and limitations of existing numerical and analytical approaches based on a full multi-level rate equation model for polarization spectroscopy.
{"title":"Optimization of polarization spectroscopy signal for laser-frequency stabilization","authors":"Rajni Bala, Joyee Ghosh and Vivek Venkataraman","doi":"10.1088/2040-8986/ad7516","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7516","url":null,"abstract":"We experimentally generate polarization spectroscopy (error) signals corresponding to the D2-line hyperfine transitions, of 87Rb, and of 85Rb, and show that the strongest error signals correspond to the closed hyperfine transitions (oscillator strength ), and , respectively. We make the generated error signal robust to fluctuations in external parameters by finding optimum values for the vapor cell temperature and pump-probe intensities at two different beam diameters. We further employ these optimized error signals to directly (without the need for frequency/phase modulation) lock the laser frequency—reducing the rms drift/linewidth from MHz to kHz, when measured over a min duration. In addition, by comparing theoretically calculated and experimentally measured error signals for the pump intensities ranging from (where, mW cm−2 is the two-level saturation intensity for the Rb D2-line transitions), we discuss the applicability and limitations of existing numerical and analytical approaches based on a full multi-level rate equation model for polarization spectroscopy.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"32 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-11DOI: 10.1088/2040-8986/ad7740
Zeynab Maleki and Tayebeh Naseri
In this work, we theoretically study a novel strategy for electromagnetically induced gratings in a complex hybrid system consisting of semiconductor quantum dots (SQDs) and metallic nanoparticles (MNPs). The plasmonic resonances of MNPs and the quantum coherence of SQDs enable the generation of unique optical phenomena such as electromagnetically induced transparency via interactions with light. Through surface plasmon interactions and quantum dot interdot tunneling, the modification of light diffraction efficiency into higher orders is achievable. Doppler broadening and nonlocality are included in the model to offer a more realistic picture of the system’s behavior in real-world scenarios. Our proposed model shows significant promise for applications in sensing technologies and nanophotonics, where it has the potential to enhance sensitivity and improve the performance of optical devices.
{"title":"A theoretical study of quantum coherence and plasmon-enhanced diffraction in practical hybrid systems including semiconductor quantum dots and metallic nanoparticles","authors":"Zeynab Maleki and Tayebeh Naseri","doi":"10.1088/2040-8986/ad7740","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7740","url":null,"abstract":"In this work, we theoretically study a novel strategy for electromagnetically induced gratings in a complex hybrid system consisting of semiconductor quantum dots (SQDs) and metallic nanoparticles (MNPs). The plasmonic resonances of MNPs and the quantum coherence of SQDs enable the generation of unique optical phenomena such as electromagnetically induced transparency via interactions with light. Through surface plasmon interactions and quantum dot interdot tunneling, the modification of light diffraction efficiency into higher orders is achievable. Doppler broadening and nonlocality are included in the model to offer a more realistic picture of the system’s behavior in real-world scenarios. Our proposed model shows significant promise for applications in sensing technologies and nanophotonics, where it has the potential to enhance sensitivity and improve the performance of optical devices.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"9 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-09DOI: 10.1088/2040-8986/ad751a
Somen Adhikary, Dipankar Ghosh and Mousumi Basu
Optical waveguides with semiconductor cores are drawing considerable research interest in the domain of supercontinuum (SC) generation in recent times. In this work, we design a square-core silicon nitride buried waveguide with a silica-clad, aiming for a wideband spectrum generation in the mid-IR region when operated at the standard telecommunication wavelength of 1550 nm. Among different such silicon nitride square-core buried waveguides, we propose a typical design with dimensions of 400 nm × 400 nm along its height and width, capable of producing a highly coherent broadband intensity spectrum ranging from 810 nm to 5441 nm after propagating through just a few millimeters of the waveguide. The group velocity dispersion maintains minimal value over a broad wavelength range in the mid-IR region, while the nonlinear coefficient is estimated to be sufficiently high. The nonlinear pulse propagation through such a waveguide leads to achieving an SC spanning over 2.76 octaves, sufficiently broader than previously reported silicon nitride-based waveguides. Furthermore, our calculations confirm the highly coherent nature of the generated SC. To the best of our knowledge, this is the first report of SC generation maintaining a high degree of coherence over such a wide wavelength range in the mid-IR zone using a square-core silicon nitride buried waveguide.
{"title":"Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide","authors":"Somen Adhikary, Dipankar Ghosh and Mousumi Basu","doi":"10.1088/2040-8986/ad751a","DOIUrl":"https://doi.org/10.1088/2040-8986/ad751a","url":null,"abstract":"Optical waveguides with semiconductor cores are drawing considerable research interest in the domain of supercontinuum (SC) generation in recent times. In this work, we design a square-core silicon nitride buried waveguide with a silica-clad, aiming for a wideband spectrum generation in the mid-IR region when operated at the standard telecommunication wavelength of 1550 nm. Among different such silicon nitride square-core buried waveguides, we propose a typical design with dimensions of 400 nm × 400 nm along its height and width, capable of producing a highly coherent broadband intensity spectrum ranging from 810 nm to 5441 nm after propagating through just a few millimeters of the waveguide. The group velocity dispersion maintains minimal value over a broad wavelength range in the mid-IR region, while the nonlinear coefficient is estimated to be sufficiently high. The nonlinear pulse propagation through such a waveguide leads to achieving an SC spanning over 2.76 octaves, sufficiently broader than previously reported silicon nitride-based waveguides. Furthermore, our calculations confirm the highly coherent nature of the generated SC. To the best of our knowledge, this is the first report of SC generation maintaining a high degree of coherence over such a wide wavelength range in the mid-IR zone using a square-core silicon nitride buried waveguide.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"54 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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