Pub Date : 2025-02-12DOI: 10.1016/j.optcom.2025.131613
Yalin Yan , Linghao Kong , Jian Qiu , Li Peng , Kaiqing Luo , Miao Chen , Peng Han , Dongmei Liu
Low-refractive-index (LRI) particles are of significant importance in numerous fields including physics, biomedicine, and material science. However, due to the repulsion of light, the effective manipulation of LRI particles remains a technically challenge. In this study, we propose and validate the customized Laguerre-Gaussian beams with adjustable topological charge, opening size and orientation for flexible manipulation of multiple LRI particles. Through experimental investigation, we demonstrated the superior efficacy of this method for the efficient collection and release of silica particles with varying diameters in an oil solution. Our research contributes to the understanding and manipulation of multiple LRI particles in vortex optical fields, with potential applications in drug delivery and nano-manipulation.
{"title":"Flexible manipulation of low-refractive-index particles based on customized Laguerre-Gaussian beams","authors":"Yalin Yan , Linghao Kong , Jian Qiu , Li Peng , Kaiqing Luo , Miao Chen , Peng Han , Dongmei Liu","doi":"10.1016/j.optcom.2025.131613","DOIUrl":"10.1016/j.optcom.2025.131613","url":null,"abstract":"<div><div>Low-refractive-index (LRI) particles are of significant importance in numerous fields including physics, biomedicine, and material science. However, due to the repulsion of light, the effective manipulation of LRI particles remains a technically challenge. In this study, we propose and validate the customized Laguerre-Gaussian beams with adjustable topological charge, opening size and orientation for flexible manipulation of multiple LRI particles. Through experimental investigation, we demonstrated the superior efficacy of this method for the efficient collection and release of silica particles with varying diameters in an oil solution. Our research contributes to the understanding and manipulation of multiple LRI particles in vortex optical fields, with potential applications in drug delivery and nano-manipulation.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131613"},"PeriodicalIF":2.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420814","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 : 2025-02-11DOI: 10.1016/j.optcom.2025.131611
Mingkun Liu , Liemao Hu , Zhenzhen Xie , Guochang Wang , Bozheng Duan , Fangjin Ning , Hui Li , Zhiyong Li , Changjun Ke , Rongqing Tan
We have developed a waveguide CO2 laser with distributed radio frequency (RF) excitation. The laser featured a folded seven-channel stable cavity structure. The physical length of laser propagation along the centerline of each channel was 2.1 m, and the total length of the gain region reached 14.0 m. Four synchronous RF exciting modules were adopted in order to realize uniform discharge in the length of 2.1 m. The output power of 405.9 W was achieved. The beam quality factors and were 1.43 and 1.58, respectively. To the best of our knowledge, 14.0 m is currently the longest single-pass gain length reported in folded waveguide structures. The laser provides a novel technical routine for achieving longer gain region, which is beneficial for amplifying CO2 lasers.
{"title":"Radio-frequency distributed-exciting waveguide CO2 laser with gain length of 14.0 m","authors":"Mingkun Liu , Liemao Hu , Zhenzhen Xie , Guochang Wang , Bozheng Duan , Fangjin Ning , Hui Li , Zhiyong Li , Changjun Ke , Rongqing Tan","doi":"10.1016/j.optcom.2025.131611","DOIUrl":"10.1016/j.optcom.2025.131611","url":null,"abstract":"<div><div>We have developed a waveguide CO<sub>2</sub> laser with distributed radio frequency (RF) excitation. The laser featured a folded seven-channel stable cavity structure. The physical length of laser propagation along the centerline of each channel was 2.1 m, and the total length of the gain region reached 14.0 m. Four synchronous RF exciting modules were adopted in order to realize uniform discharge in the length of 2.1 m. The output power of 405.9 W was achieved. The beam quality factors <span><math><mrow><msubsup><mi>M</mi><mi>x</mi><mn>2</mn></msubsup></mrow></math></span> and <span><math><mrow><msubsup><mi>M</mi><mi>y</mi><mn>2</mn></msubsup></mrow></math></span> were 1.43 and 1.58, respectively. To the best of our knowledge, 14.0 m is currently the longest single-pass gain length reported in folded waveguide structures. The laser provides a novel technical routine for achieving longer gain region, which is beneficial for amplifying CO<sub>2</sub> lasers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131611"},"PeriodicalIF":2.2,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430155","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 : 2025-02-11DOI: 10.1016/j.optcom.2025.131589
Yuyuan Han , Huaibin Zheng , Bin Li , Jingwei Li , Long Qiu , Wenxuan Hao , Zheng Dang , Hui Chen , Jianbin Liu , Yuchen He , Yanyan Liu , Zhuo Xu
The pursuit of ghost imaging (GI) in high speed and miniaturization has led researchers to explore photonic integrated circuits (PICs). This study delves into the pattern characteristics of optical phased arrays (OPAs) based on PICs and identifies a limitation in traditional GI denoising algorithms when employing line pattern illumination field generated by one dimensional OPA (1D OPA) with grating waveguide (GW), attributed to noise symmetry disruption. To overcome this challenge, we introduce the symmetry of noise metric , tailored to evaluate noise symmetry across different field matrix. Subsequently, we propose the loop differential ghost imaging (LDGI) algorithm, demonstrating orders of magnitude improvement compared to traditional algorithms in GI. This research advances GI technology towards integrated miniaturization and achieving high speed imaging capabilities, with implications for fields such as virtual reality, LiDAR, and photomicrography.
{"title":"Loop differential ghost imaging based on line pattern","authors":"Yuyuan Han , Huaibin Zheng , Bin Li , Jingwei Li , Long Qiu , Wenxuan Hao , Zheng Dang , Hui Chen , Jianbin Liu , Yuchen He , Yanyan Liu , Zhuo Xu","doi":"10.1016/j.optcom.2025.131589","DOIUrl":"10.1016/j.optcom.2025.131589","url":null,"abstract":"<div><div>The pursuit of ghost imaging (GI) in high speed and miniaturization has led researchers to explore photonic integrated circuits (PICs). This study delves into the pattern characteristics of optical phased arrays (OPAs) based on PICs and identifies a limitation in traditional GI denoising algorithms when employing line pattern illumination field generated by one dimensional OPA (1D OPA) with grating waveguide (GW), attributed to noise symmetry disruption. To overcome this challenge, we introduce the symmetry of noise metric <span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>, tailored to evaluate noise symmetry across different field matrix. Subsequently, we propose the loop differential ghost imaging (LDGI) algorithm, demonstrating orders of magnitude improvement compared to traditional algorithms in GI. This research advances GI technology towards integrated miniaturization and achieving high speed imaging capabilities, with implications for fields such as virtual reality, LiDAR, and photomicrography.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131589"},"PeriodicalIF":2.2,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403534","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 : 2025-02-10DOI: 10.1016/j.optcom.2025.131602
Qingying Dai , Lifang Mei , Dongbing Yan , Shuixuan Chen , Zhiheng Zeng , Hongji Tian
Particle contaminants on the surfaces of semiconductor devices can significantly affect their electrical performance. The advantages of picosecond laser beams for non-thermal dispersion and agglomeration of large particles are combined with the thermal expansion effect of nanosecond laser beams to remove smaller particles. A sequential method using picosecond and nanosecond lasers was used to remove Al2O3 particle contaminants from the surfaces of silicon wafers. Numerical simulation models were established for different laser pulse widths to quantify the laser cleaning force, enabling the prediction of the cleaning threshold for Al2O3 particles and the damage threshold of the silicon substrate, followed by experimental validation. The results show that the cleaning thresholds for 1-μm Al2O3 particles are 0.4934 J/cm2 and 5.38 J/cm2 using picosecond and nanosecond lasers, respectively, while the damage thresholds for the silicon substrate are 0.5702 J/cm2 and 6.68 J/cm2, respectively. As the laser energy density increased, particle removal from the silicon substrate surface initially increased and then decreased. In addition, sequential dual-beam cleaning outperformed single-beam laser cleaning in terms of the particle removal rate, surface roughness, and surface micromorphology. The pico-nanosecond dual-beam sequential mode provides better cleaning results than the nano-picosecond sequential mode, achieving a particle removal rate of up to 97.8%, surface roughness Sz as low as 0.027 μm, and a smoother, more uniform surface microstructure. After cleaning, the silicon wafer surface closely resembled the original silicon surface.
{"title":"Pico-nanosecond serial dual-beam laser cleaning of Al2O3 particles on silicon wafer surfaces","authors":"Qingying Dai , Lifang Mei , Dongbing Yan , Shuixuan Chen , Zhiheng Zeng , Hongji Tian","doi":"10.1016/j.optcom.2025.131602","DOIUrl":"10.1016/j.optcom.2025.131602","url":null,"abstract":"<div><div>Particle contaminants on the surfaces of semiconductor devices can significantly affect their electrical performance. The advantages of picosecond laser beams for non-thermal dispersion and agglomeration of large particles are combined with the thermal expansion effect of nanosecond laser beams to remove smaller particles. A sequential method using picosecond and nanosecond lasers was used to remove Al<sub>2</sub>O<sub>3</sub> particle contaminants from the surfaces of silicon wafers. Numerical simulation models were established for different laser pulse widths to quantify the laser cleaning force, enabling the prediction of the cleaning threshold for Al<sub>2</sub>O<sub>3</sub> particles and the damage threshold of the silicon substrate, followed by experimental validation. The results show that the cleaning thresholds for 1-μm Al<sub>2</sub>O<sub>3</sub> particles are 0.4934 J/cm<sup>2</sup> and 5.38 J/cm<sup>2</sup> using picosecond and nanosecond lasers, respectively, while the damage thresholds for the silicon substrate are 0.5702 J/cm<sup>2</sup> and 6.68 J/cm<sup>2</sup>, respectively. As the laser energy density increased, particle removal from the silicon substrate surface initially increased and then decreased. In addition, sequential dual-beam cleaning outperformed single-beam laser cleaning in terms of the particle removal rate, surface roughness, and surface micromorphology. The pico-nanosecond dual-beam sequential mode provides better cleaning results than the nano-picosecond sequential mode, achieving a particle removal rate of up to 97.8%, surface roughness Sz as low as 0.027 μm, and a smoother, more uniform surface microstructure. After cleaning, the silicon wafer surface closely resembled the original silicon surface.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131602"},"PeriodicalIF":2.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420813","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 : 2025-02-10DOI: 10.1016/j.optcom.2025.131605
Yeqing He , Anmin Yin , Lei Zheng , Da Xu , Zhenxin Xia , Xiaodong Xu
In this paper, the relationship between the ultrasonic eigenvalue and the microstructure of Ti–6Al–4V titanium alloy fabricated using selective laser melting (SLM) after annealing treatment is investigated, and a relationship model correlating the ultrasonic center frequency offset with dislocation density is developed. Based on dislocation strengthening theory, models for yield strength, tensile strength, and hardness, derived from the ultrasonic center frequency offset, are further developed and validated using experimental data. The results indicate that the microstructure and mechanical property model based on ultrasonic center frequency offset achieves an accuracy of approximately 0.89.
{"title":"Microstructure and mechanical properties detecting of annealed SLM Ti–6Al–4V by laser ultrasonic center frequency offset","authors":"Yeqing He , Anmin Yin , Lei Zheng , Da Xu , Zhenxin Xia , Xiaodong Xu","doi":"10.1016/j.optcom.2025.131605","DOIUrl":"10.1016/j.optcom.2025.131605","url":null,"abstract":"<div><div>In this paper, the relationship between the ultrasonic eigenvalue and the microstructure of Ti–6Al–4V titanium alloy fabricated using selective laser melting (SLM) after annealing treatment is investigated, and a relationship model correlating the ultrasonic center frequency offset with dislocation density is developed. Based on dislocation strengthening theory, models for yield strength, tensile strength, and hardness, derived from the ultrasonic center frequency offset, are further developed and validated using experimental data. The results indicate that the microstructure and mechanical property model based on ultrasonic center frequency offset achieves an accuracy of approximately 0.89.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"579 ","pages":"Article 131605"},"PeriodicalIF":2.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395470","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 : 2025-02-10DOI: 10.1016/j.optcom.2025.131606
Yin Zhang , Yijie Cai , Ao Chen , Wenwen Yu , Yi Li
C4F7N gas mixtures, due to its high insulation strength and low global warming potential, is gradually replacing SF6 gas in gas-insulated equipment. To ensure the safe and reliable operation of new C4F7N gas mixture insulated equipment, real-time monitoring of the C4F7N gas concentration in the equipment is of significant engineering importance. In this paper, a micro fiber coated with carboxylated carbon nanotubes gas detection method based on fiber-loop ring-down (FLRD) technology is presented. Firstly, based on Density Functional Theory (DFT), the study establishes four adsorption systems: C4F7N-SWNT, C4F7N-SWNT-COOH, O2-SWNT-COOH, and CO2-SWNT-COOH, to explore the potential application of carboxyl-functionalized carbon nanotubes as selective adsorbents for C4F7N. Subsequently, a FLRD demodulation system was constructed, incorporating a micro fiber coated with carboxylated carbon nanotubes for experimental validation. The results showed that the sensor exhibited selective detection capability for C4F7N in the gas mixture. Finally, the detection performance of the FLRD system was analyzed using the least squares method. The results showed that the linear fit between the C4F7N gas concentration and the ring-down time had a coefficient of determination (R2) of 0.997, with a maximum relative error of 4.088%. Under a background of 4% C4F7N gas mixture, the detection repeatability of the system was 0.00698. The research results provide a theoretical foundation and technical reference for the online monitoring of the new C4F7N gas mixture insulated equipment.
{"title":"Gas sensor based on micro fiber coated with carboxylated carbon nanotubes to detect new environmentally friendly insulating gas C4F7N","authors":"Yin Zhang , Yijie Cai , Ao Chen , Wenwen Yu , Yi Li","doi":"10.1016/j.optcom.2025.131606","DOIUrl":"10.1016/j.optcom.2025.131606","url":null,"abstract":"<div><div>C<sub>4</sub>F<sub>7</sub>N gas mixtures, due to its high insulation strength and low global warming potential, is gradually replacing SF<sub>6</sub> gas in gas-insulated equipment. To ensure the safe and reliable operation of new C<sub>4</sub>F<sub>7</sub>N gas mixture insulated equipment, real-time monitoring of the C<sub>4</sub>F<sub>7</sub>N gas concentration in the equipment is of significant engineering importance. In this paper, a micro fiber coated with carboxylated carbon nanotubes gas detection method based on fiber-loop ring-down (FLRD) technology is presented. Firstly, based on Density Functional Theory (DFT), the study establishes four adsorption systems: C<sub>4</sub>F<sub>7</sub>N-SWNT, C<sub>4</sub>F<sub>7</sub>N-SWNT-COOH, O<sub>2</sub>-SWNT-COOH, and CO<sub>2</sub>-SWNT-COOH, to explore the potential application of carboxyl-functionalized carbon nanotubes as selective adsorbents for C<sub>4</sub>F<sub>7</sub>N. Subsequently, a FLRD demodulation system was constructed, incorporating a micro fiber coated with carboxylated carbon nanotubes for experimental validation. The results showed that the sensor exhibited selective detection capability for C<sub>4</sub>F<sub>7</sub>N in the gas mixture. Finally, the detection performance of the FLRD system was analyzed using the least squares method. The results showed that the linear fit between the C<sub>4</sub>F<sub>7</sub>N gas concentration and the ring-down time had a coefficient of determination (R<sup>2</sup>) of 0.997, with a maximum relative error of 4.088%. Under a background of 4% C<sub>4</sub>F<sub>7</sub>N gas mixture, the detection repeatability of the system was 0.00698. The research results provide a theoretical foundation and technical reference for the online monitoring of the new C<sub>4</sub>F<sub>7</sub>N gas mixture insulated equipment.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131606"},"PeriodicalIF":2.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420815","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 : 2025-02-10DOI: 10.1016/j.optcom.2025.131585
Yuejian Jiao , Mengyuan Liu , Xiaozhuo Qi , Lei Xu , Guoquan Zhang
Second harmonic generation (SHG) at nanoscales have broad applications in integrated optoelectronic devices. In this paper, we numerically demonstrate highly efficient and electrically tunable SHG in metasurface with etchless lithium niobate (LN), based on symmetry-protected bound states in the continuum (BIC). Since the excellent electro-optic (EO) properties of LN, the symmetry of structural refractive index can be very slightly broken under an external voltage, resulting in the excitation of quasi-BIC with an ultrahigh quality factor ( factor). When asymmetry parameter is set to be , a quasi-BIC with factor as high as magnitude is excited, achieving 1.2% conversion efficiency of SHG under 0.1 kW/cm input intensity. We also show that the factor and conversion efficiency can be actively and finely modulated by tuning asymmetry factor based on EO effects of LN. Our work provides a feasible idea to excite quasi-BIC with ultrahigh and accurately tunable factor, and paves a way in designing electrically tunable ultracompact light sources.
{"title":"High efficiency and tunable second harmonic generation in electro-optic Q-modulated metasurface with etchless lithium niobate","authors":"Yuejian Jiao , Mengyuan Liu , Xiaozhuo Qi , Lei Xu , Guoquan Zhang","doi":"10.1016/j.optcom.2025.131585","DOIUrl":"10.1016/j.optcom.2025.131585","url":null,"abstract":"<div><div>Second harmonic generation (SHG) at nanoscales have broad applications in integrated optoelectronic devices. In this paper, we numerically demonstrate highly efficient and electrically tunable SHG in metasurface with etchless lithium niobate (LN), based on symmetry-protected bound states in the continuum (BIC). Since the excellent electro-optic (EO) properties of LN, the symmetry of structural refractive index can be very slightly broken under an external voltage, resulting in the excitation of quasi-BIC with an ultrahigh quality factor (<span><math><mi>Q</mi></math></span> factor). When asymmetry parameter is set to be <span><math><mrow><mi>Δ</mi><mi>n</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>001</mn></mrow></math></span>, a quasi-BIC with <span><math><mi>Q</mi></math></span> factor as high as <span><math><mrow><mn>5</mn><mo>.</mo><mn>4</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>7</mn></mrow></msup></mrow></math></span> magnitude is excited, achieving 1.2% conversion efficiency of SHG under 0.1 kW/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> input intensity. We also show that the <span><math><mi>Q</mi></math></span> factor and conversion efficiency can be actively and finely modulated by tuning asymmetry factor <span><math><mrow><mi>Δ</mi><mi>n</mi></mrow></math></span> based on EO effects of LN. Our work provides a feasible idea to excite quasi-BIC with ultrahigh and accurately tunable <span><math><mi>Q</mi></math></span> factor, and paves a way in designing electrically tunable ultracompact light sources.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"579 ","pages":"Article 131585"},"PeriodicalIF":2.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379086","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 nanophotonics, achieving dynamic reconfiguration and multipole resonance in dielectric metasurfaces is crucial for developing high-performance spectral filters. In this work, we propose a tunable all-dielectric metasurface based on the bound states in the continuum (BICs) mechanism, designed as a multi-channel optical filter that can cover different near-infrared communication bands. It exhibits high transmittance, narrow bandwidth, dynamic tunability, and good angle robustness. Using the quasi-BIC mechanism, we demonstrated that breaking structural symmetry could effectively excite multiple sharp Fano resonances, enabling the filter to switch between two and four channels flexibly. By analyzing the electromagnetic field distribution at different transmission peaks, the contribution of different electromagnetic excitations to Fano resonance was discussed. Additionally, the dynamic tuning of multiple Fano resonances was achieved by adjusting the refractive index of the phase-change material Ge2Sb2Te5 (GST), while internal tuning was achieved by optimizing the structural parameters. The design also exhibits good angle robustness at small oblique incidence angles (<25°). Therefore, this design demonstrates significant advantages in terms of feasibility and practicability, which may provide an essential reference for designing and applying future high-performance multi-channel filters.
{"title":"Multi-channel filtering and dynamic modulation of multiple Fano resonances in all-dielectric metasurfaces","authors":"Yuting Zhang , Jing Zhu , Wei Wu , Jianglin Chen , Lianqing Zhu","doi":"10.1016/j.optcom.2025.131603","DOIUrl":"10.1016/j.optcom.2025.131603","url":null,"abstract":"<div><div>In nanophotonics, achieving dynamic reconfiguration and multipole resonance in dielectric metasurfaces is crucial for developing high-performance spectral filters. In this work, we propose a tunable all-dielectric metasurface based on the bound states in the continuum (BICs) mechanism, designed as a multi-channel optical filter that can cover different near-infrared communication bands. It exhibits high transmittance, narrow bandwidth, dynamic tunability, and good angle robustness. Using the quasi-BIC mechanism, we demonstrated that breaking structural symmetry could effectively excite multiple sharp Fano resonances, enabling the filter to switch between two and four channels flexibly. By analyzing the electromagnetic field distribution at different transmission peaks, the contribution of different electromagnetic excitations to Fano resonance was discussed. Additionally, the dynamic tuning of multiple Fano resonances was achieved by adjusting the refractive index of the phase-change material Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST), while internal tuning was achieved by optimizing the structural parameters. The design also exhibits good angle robustness at small oblique incidence angles (<25°). Therefore, this design demonstrates significant advantages in terms of feasibility and practicability, which may provide an essential reference for designing and applying future high-performance multi-channel filters.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131603"},"PeriodicalIF":2.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420816","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 : 2025-02-08DOI: 10.1016/j.optcom.2025.131584
Martin Bock , Usman Sapaev , Ji Eun Bae , Anton Husakou , Joachim Herrmann , Tamas Nagy , Uwe Griebner
We experimentally and numerically investigate self-compression of pulses around wavelength in a noble-gas-filled hollow waveguides. We demonstrate spectral broadening of multi-mJ pulses at and associated pulse compression from 85 fs to 47 fs in the solitonic pulse compression regime. The self-compression resulted in sub-three-cycle pulses with 17 GW peak power in the 1-kHz pulse train. A numerical model is established and benchmarked against the experimental results. It allows further insights into the pulse compression process, such as scaling of the compression as a function of gas pressure and waveguide radius, and predicts pulse compression in sub-cycle regime for realistic input parameters.
{"title":"Self-compression of 5-μm pulses in hollow waveguides","authors":"Martin Bock , Usman Sapaev , Ji Eun Bae , Anton Husakou , Joachim Herrmann , Tamas Nagy , Uwe Griebner","doi":"10.1016/j.optcom.2025.131584","DOIUrl":"10.1016/j.optcom.2025.131584","url":null,"abstract":"<div><div>We experimentally and numerically investigate self-compression of pulses around <span><math><mrow><mn>5</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> wavelength in a noble-gas-filled hollow waveguides. We demonstrate spectral broadening of multi-mJ pulses at <span><math><mrow><mn>4</mn><mo>.</mo><mn>9</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> and associated pulse compression from 85 fs to 47 fs in the solitonic pulse compression regime. The self-compression resulted in sub-three-cycle pulses with 17 GW peak power in the 1-kHz pulse train. A numerical model is established and benchmarked against the experimental results. It allows further insights into the pulse compression process, such as scaling of the compression as a function of gas pressure and waveguide radius, and predicts pulse compression in sub-cycle regime for realistic input parameters.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"579 ","pages":"Article 131584"},"PeriodicalIF":2.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387943","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 : 2025-02-08DOI: 10.1016/j.optcom.2025.131588
Chenlong Xu , Liu Yang , Ying Wang , Zihan Chen , Ting Jin , Yonggang Zhang
Optical noise in resonant fiber-optic gyro (RFOG), such as coherence-related noise, has been suppressed using a broadband source. Consequently, the relative intensity noise (RIN) of optical source has become the primary source of interference in RFOG. There have been some methods to suppress the RIN, but they are all passive and still affected by the fluctuation of light source. In this paper, we propose a light intensity fluctuation offset technique to actively suppress the RIN, thereby improving the performance of angle random walk (ARW). This technique can completely offset light intensity fluctuations in theoretically. In experiment, the ARW is 0.0031 which represents a 18.4% improvement compared to that of the traditional passive scheme in a 114-m-long fiber ring resonator (FRR) with an internal diameter of 6 cm. This work effectively reduces short-term fluctuation and is significant for RFOG applications.
{"title":"Suppression of RIN in broadband source-driven RFOG using a light intensity fluctuation offset technique","authors":"Chenlong Xu , Liu Yang , Ying Wang , Zihan Chen , Ting Jin , Yonggang Zhang","doi":"10.1016/j.optcom.2025.131588","DOIUrl":"10.1016/j.optcom.2025.131588","url":null,"abstract":"<div><div>Optical noise in resonant fiber-optic gyro (RFOG), such as coherence-related noise, has been suppressed using a broadband source. Consequently, the relative intensity noise (RIN) of optical source has become the primary source of interference in RFOG. There have been some methods to suppress the RIN, but they are all passive and still affected by the fluctuation of light source. In this paper, we propose a light intensity fluctuation offset technique to actively suppress the RIN, thereby improving the performance of angle random walk (ARW). This technique can completely offset light intensity fluctuations in theoretically. In experiment, the ARW is 0.0031 <span><math><mrow><mo>°</mo><mo>/</mo><msup><mi>h</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></math></span> which represents a 18.4% improvement compared to that of the traditional passive scheme in a 114-m-long fiber ring resonator (FRR) with an internal diameter of 6 cm. This work effectively reduces short-term fluctuation and is significant for RFOG applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"580 ","pages":"Article 131588"},"PeriodicalIF":2.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436908","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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