Pub Date : 2024-08-21DOI: 10.1109/LPT.2024.3447012
Keiji Kuroda
This letter reports time-division multiplexed interrogation of fiber Bragg gratings distributed in a single long fiber. A heterodyne detection technique is used to sensitively detect weak reflections from fiber Bragg gratings. Reflection spectra of three fiber Bragg gratings located at 14 m, 2 km, and 42 km, each with a reflectivity of 1%, are simultaneously observed with sufficient signal-to-noise ratios.
{"title":"Long-Distance Quasi-Distributed FBG Sensor System Based on Time-Division Multiplexing","authors":"Keiji Kuroda","doi":"10.1109/LPT.2024.3447012","DOIUrl":"https://doi.org/10.1109/LPT.2024.3447012","url":null,"abstract":"This letter reports time-division multiplexed interrogation of fiber Bragg gratings distributed in a single long fiber. A heterodyne detection technique is used to sensitively detect weak reflections from fiber Bragg gratings. Reflection spectra of three fiber Bragg gratings located at 14 m, 2 km, and 42 km, each with a reflectivity of 1%, are simultaneously observed with sufficient signal-to-noise ratios.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1133-1136"},"PeriodicalIF":2.3,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this letter, we present a new implicit optimizing method for optical device’s or system’s design and optimization. This method, derived from the traditional adaptive moment estimation algorithm which has been more and more frequently adopted in disciplinary fields of artificially intelligence, provides one potential feasible way of directly optimizing photonic systems or device without the help of extra AI or mathematical models which need to be established and trained in most cases of AI photonics. Moreover, optimizing efficiency are prominently promoted since this method takes gradient information into consideration to guide the optimization. This method’s fidelity and performance is demonstrated under the case of designing on-chip metasurface structured photonic logic gates.
{"title":"Implicit Adaptive Moment Estimation Method for On-Chip Metasurface Design and Optimization","authors":"Yubin Zang;Simin Li;Fangzheng Zhang;Zuxing Zhang;Hongwei Chen","doi":"10.1109/LPT.2024.3447027","DOIUrl":"10.1109/LPT.2024.3447027","url":null,"abstract":"In this letter, we present a new implicit optimizing method for optical device’s or system’s design and optimization. This method, derived from the traditional adaptive moment estimation algorithm which has been more and more frequently adopted in disciplinary fields of artificially intelligence, provides one potential feasible way of directly optimizing photonic systems or device without the help of extra AI or mathematical models which need to be established and trained in most cases of AI photonics. Moreover, optimizing efficiency are prominently promoted since this method takes gradient information into consideration to guide the optimization. This method’s fidelity and performance is demonstrated under the case of designing on-chip metasurface structured photonic logic gates.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 20","pages":"1233-1236"},"PeriodicalIF":2.3,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose and demonstrate a single-end-access dynamic Brillouin optical correlation-domain analysis sensor based on the multi-core fiber (MCF) and lock-in-amplifier-free detection scheme. The pump and the probe are individually injected into two cores at the same end of a 7-core MCF, where the cores are directly connected at the other end through fan-in/fan-out couplers to achieve single-ended access. Using another pair of cores as a reference path, the Brillouin gain information along two sensing cores is extracted through power subtraction processing, which eliminates the additional reference fiber links and further suppresses the parasitic intensity modulation noise. A measurement accuracy of 1.41 MHz is achieved at a 200-kHz sampling rate. Sensing information from two sensing cores are simultaneously acquired, allowing longitudinal and radial strain measurements. For proof of concept, measurements of up to 1-kHz longitudinal vibration and a 13.1-Hz radial bending-induced vibration are successfully demonstrated with 10-cm spatial resolution, showing great potential for fast high-resolution dynamic strain measurement.
{"title":"Single-End-Access BOCDA Enabled by Multi-Core Fiber for Dynamic Strain Measurements","authors":"Huan He;Shuyan Chen;Zhiyong Zhao;Dongmei Huang;Ming Tang","doi":"10.1109/LPT.2024.3446892","DOIUrl":"https://doi.org/10.1109/LPT.2024.3446892","url":null,"abstract":"We propose and demonstrate a single-end-access dynamic Brillouin optical correlation-domain analysis sensor based on the multi-core fiber (MCF) and lock-in-amplifier-free detection scheme. The pump and the probe are individually injected into two cores at the same end of a 7-core MCF, where the cores are directly connected at the other end through fan-in/fan-out couplers to achieve single-ended access. Using another pair of cores as a reference path, the Brillouin gain information along two sensing cores is extracted through power subtraction processing, which eliminates the additional reference fiber links and further suppresses the parasitic intensity modulation noise. A measurement accuracy of 1.41 MHz is achieved at a 200-kHz sampling rate. Sensing information from two sensing cores are simultaneously acquired, allowing longitudinal and radial strain measurements. For proof of concept, measurements of up to 1-kHz longitudinal vibration and a 13.1-Hz radial bending-induced vibration are successfully demonstrated with 10-cm spatial resolution, showing great potential for fast high-resolution dynamic strain measurement.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 19","pages":"1177-1180"},"PeriodicalIF":2.3,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-19DOI: 10.1109/LPT.2024.3445727
Y. Jiang;J. Sarkis;A. Nespola;F. Forghieri;S. Piciaccia;A. Tanzi;M. Ranjbar Zefreh;P. Poggiolini
We investigate C+L+S long-haul systems using a closed-form GN/EGN non-linearity model. We perform accurate launch power and Raman pump optimization. We show a potential 4x throughput increase over legacy C-band systems in 1000 km links, using moderate S-only Raman amplification. We simultaneously achieve extra-flat GSNR, within ±0.5 dB across the whole C+L+S spectrum.
我们利用闭式 GN/EGN 非线性模型研究了 C+L+S 长途运输系统。我们进行了精确的发射功率和拉曼泵优化。我们表明，在 1000 公里链路中，使用适度的纯 S 拉曼放大，吞吐量可能比传统 C 波段系统提高 4 倍。同时，我们在整个 C+L+S 频谱上实现了 ±0.5 dB 范围内的超平 GSNR。
{"title":"Optimization of Long-Haul C+L+S Systems by Means of a Closed Form EGN Model","authors":"Y. Jiang;J. Sarkis;A. Nespola;F. Forghieri;S. Piciaccia;A. Tanzi;M. Ranjbar Zefreh;P. Poggiolini","doi":"10.1109/LPT.2024.3445727","DOIUrl":"https://doi.org/10.1109/LPT.2024.3445727","url":null,"abstract":"We investigate C+L+S long-haul systems using a closed-form GN/EGN non-linearity model. We perform accurate launch power and Raman pump optimization. We show a potential 4x throughput increase over legacy C-band systems in 1000 km links, using moderate S-only Raman amplification. We simultaneously achieve extra-flat GSNR, within ±0.5 dB across the whole C+L+S spectrum.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1129-1132"},"PeriodicalIF":2.3,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-15DOI: 10.1109/LPT.2024.3444328
Elena A. Anashkina;Alexey V. Andrianov
We demonstrate cascade Brillouin lasing in a silica microsphere with 11-GHz spectral spacing between neighboring orders. Using unidirectional pump, up to three Brillouin cascades are attained in both forward and backward spectra due to Rayleigh scattering. We show experimentally and numerically that for weak and strong intermode coupling, the system behavior differs. For weak coupling, first-order Brillouin waves are mainly generated in the backward direction while second-order waves are mainly observed in the forward one. For strong coupling, powers for each order are the same in both directions.
{"title":"Brillouin Lasing in a Silica Microsphere With Allowance for Rayleigh Scattering","authors":"Elena A. Anashkina;Alexey V. Andrianov","doi":"10.1109/LPT.2024.3444328","DOIUrl":"https://doi.org/10.1109/LPT.2024.3444328","url":null,"abstract":"We demonstrate cascade Brillouin lasing in a silica microsphere with 11-GHz spectral spacing between neighboring orders. Using unidirectional pump, up to three Brillouin cascades are attained in both forward and backward spectra due to Rayleigh scattering. We show experimentally and numerically that for weak and strong intermode coupling, the system behavior differs. For weak coupling, first-order Brillouin waves are mainly generated in the backward direction while second-order waves are mainly observed in the forward one. For strong coupling, powers for each order are the same in both directions.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1121-1124"},"PeriodicalIF":2.3,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this letter, a comparative adaptive extreme learning machine (CAELM) is proposed for continuous prediction of optical chaos with a simple updating rule and low computational complexity. A recursive least square (RLS) with a adaptive forgetting factor (AFF) updating method is devised to track the dynamics of the optical chaos. The results demonstrate that the proposed CAELM can effectively execute the time-varying optical chaos predictions, and delivers much better performance in terms of normalized mean squared error (NMSE), with a value of $2.4times 10 ^{-4}$ . It also demands fewer training samples than state-of-the-art adaptive methods. Finally, we validate CAELM’s generalization capability under the condition of changing laser parameters, and the proposed CAELM remains accurate and adaptive to predict the time-varying optical chaos with very short training length for the model update.
{"title":"Prediction of Optical Chaos Using a Comparative Adaptive Extreme Learning Machine","authors":"Yuanlong Fan;Chen Ma;Dawei Gao;Yangyundou Wang;Xiaopeng Shao","doi":"10.1109/LPT.2024.3442813","DOIUrl":"https://doi.org/10.1109/LPT.2024.3442813","url":null,"abstract":"In this letter, a comparative adaptive extreme learning machine (CAELM) is proposed for continuous prediction of optical chaos with a simple updating rule and low computational complexity. A recursive least square (RLS) with a adaptive forgetting factor (AFF) updating method is devised to track the dynamics of the optical chaos. The results demonstrate that the proposed CAELM can effectively execute the time-varying optical chaos predictions, and delivers much better performance in terms of normalized mean squared error (NMSE), with a value of \u0000<inline-formula> <tex-math>$2.4times 10 ^{-4}$ </tex-math></inline-formula>\u0000. It also demands fewer training samples than state-of-the-art adaptive methods. Finally, we validate CAELM’s generalization capability under the condition of changing laser parameters, and the proposed CAELM remains accurate and adaptive to predict the time-varying optical chaos with very short training length for the model update.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1109-1112"},"PeriodicalIF":2.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-13DOI: 10.1109/LPT.2024.3442969
Shikha Singh;Satyabrata Jit
An Ag/MoSe2 thin film/Ag structure based metal-semiconductor-metal (MSM) broadband photodetector fabricated on SiO2 coated Si substrate is reported in this letter. The nano-powder synthesized by the hydrothermal route was used for fabricating MoSe2 thin film by thermal evaporation technique. The interdigitated Ag Schottky contacts were fabricated on the MoSe2 film by thermal evaporation method to obtain the desired structure. Photoresponse of the proposed MSM device was measured using monochromatic light of 300 nm–1100 nm. The response showed the maximum responsivity, detectivity and external quantum efficiency (EQE) of ~50 mA/W, $sim 4.5times 10^{11}$ Jones and $sim ~16$ % respectively at 415 nm (incident power density of $sim 70~mu $ W/cm2) under the applied bias voltage of 1.5 V. The fabricated device also shows fast time response with rise (fall) time as 17.8 ms (18.3 ms).
{"title":"Thermally Grown MoSe2 Thin Film Based MSM Broadband Photodetector","authors":"Shikha Singh;Satyabrata Jit","doi":"10.1109/LPT.2024.3442969","DOIUrl":"https://doi.org/10.1109/LPT.2024.3442969","url":null,"abstract":"An Ag/MoSe2 thin film/Ag structure based metal-semiconductor-metal (MSM) broadband photodetector fabricated on SiO2 coated Si substrate is reported in this letter. The nano-powder synthesized by the hydrothermal route was used for fabricating MoSe2 thin film by thermal evaporation technique. The interdigitated Ag Schottky contacts were fabricated on the MoSe2 film by thermal evaporation method to obtain the desired structure. Photoresponse of the proposed MSM device was measured using monochromatic light of 300 nm–1100 nm. The response showed the maximum responsivity, detectivity and external quantum efficiency (EQE) of ~50 mA/W, \u0000<inline-formula> <tex-math>$sim 4.5times 10^{11}$ </tex-math></inline-formula>\u0000 Jones and \u0000<inline-formula> <tex-math>$sim ~16$ </tex-math></inline-formula>\u0000% respectively at 415 nm (incident power density of \u0000<inline-formula> <tex-math>$sim 70~mu $ </tex-math></inline-formula>\u0000W/cm2) under the applied bias voltage of 1.5 V. The fabricated device also shows fast time response with rise (fall) time as 17.8 ms (18.3 ms).","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1105-1108"},"PeriodicalIF":2.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-12DOI: 10.1109/LPT.2024.3442229
Chuan Tian;Xuening Chen;Yaqi Ren;Meng Wang;Xiaolei Bai
An external force sensing strategy based on the bend and strain characteristics of SMS fiber structure for liquid surface tension is demonstrated in this work. The bent SMS fiber structure is used to optimize the traditional pull-off method by improving the measurement of the tensile force. Experimental results show that the sensitivity of the sensor is 1.97221 nm/mN, suitable for measuring small tensile forces, with the minimum force change of $10.1409~mu $ N and the linearity of 99.85%. The maximum relative error of LSTC is $pm 0.282times 10^{-3}$ N/m. Theoretical and experimental results prove that using a bent SMS fiber structure is a feasible approach for accurately measuring liquid surface tension.
{"title":"External Force Sensing Strategy for Surface Tension Based on SMS Fiber Structure","authors":"Chuan Tian;Xuening Chen;Yaqi Ren;Meng Wang;Xiaolei Bai","doi":"10.1109/LPT.2024.3442229","DOIUrl":"10.1109/LPT.2024.3442229","url":null,"abstract":"An external force sensing strategy based on the bend and strain characteristics of SMS fiber structure for liquid surface tension is demonstrated in this work. The bent SMS fiber structure is used to optimize the traditional pull-off method by improving the measurement of the tensile force. Experimental results show that the sensitivity of the sensor is 1.97221 nm/mN, suitable for measuring small tensile forces, with the minimum force change of \u0000<inline-formula> <tex-math>$10.1409~mu $ </tex-math></inline-formula>\u0000 N and the linearity of 99.85%. The maximum relative error of LSTC is \u0000<inline-formula> <tex-math>$pm 0.282times 10^{-3}$ </tex-math></inline-formula>\u0000 N/m. Theoretical and experimental results prove that using a bent SMS fiber structure is a feasible approach for accurately measuring liquid surface tension.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 19","pages":"1197-1200"},"PeriodicalIF":2.3,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-12DOI: 10.1109/LPT.2024.3441749
Tulika Bajpai;Saumya Tripathi;Ajay Kumar Dwivedi;R. K. Nagaria;Shweta Tripathi
This letter reports a Al/WSe2:MoS2/ITO coated PET structure based broadband photodetector. The device utilizes WSe2: MoS2 nanocomposite (NC) as an active layer prepared using dispersion method. The nanocomposite film was deposited over ITO coated PET through spin coating technique. The Al contacts were deposited over WSe2: MoS2 nanocomposite by means of thermal evaporation unit. The proposed photodetector exhibits a broad photo response with maximum responsivity $text {R}_{text {S}}$ (A/W) of 10.75 A/W, 85.45 A/W, and 146.96 A/W; at 350nm (UV), 750nm (visible) and 900nm (IR) at -1V bias. The nanocomposite shows promising characteristics for optoelectronic application. WSe2:MoS2 NC shows a wide absorbance spectra, covering ultraviolet (UV)-visible-near infrared (NIR) regions.
这封信报告了一种基于 Al/WSe2:MoS2/ITO 涂层 PET 结构的宽带光电探测器。该器件采用 WSe2：MoS2 纳米复合材料 (NC) 作为活性层。纳米复合薄膜通过旋涂技术沉积在 ITO 涂层 PET 上。铝触点沉积在 WSe2：MoS2 纳米复合材料上沉积了铝触点。所提出的光电探测器具有广泛的光响应，在-1V偏压下，350nm（紫外）、750nm（可见光）和900nm（红外）波长处的最大响应率分别为10.75 A/W、85.45 A/W和146.96 A/W。该纳米复合材料在光电应用方面表现出了良好的特性。WSe2:MoS2 NC 具有宽广的吸收光谱，涵盖紫外（UV）-可见光-近红外（NIR）区域。
{"title":"WSe₂ and MoS₂ Nanocomposite-Based Efficient Broadband Photodetector","authors":"Tulika Bajpai;Saumya Tripathi;Ajay Kumar Dwivedi;R. K. Nagaria;Shweta Tripathi","doi":"10.1109/LPT.2024.3441749","DOIUrl":"https://doi.org/10.1109/LPT.2024.3441749","url":null,"abstract":"This letter reports a Al/WSe2:MoS2/ITO coated PET structure based broadband photodetector. The device utilizes WSe2: MoS2 nanocomposite (NC) as an active layer prepared using dispersion method. The nanocomposite film was deposited over ITO coated PET through spin coating technique. The Al contacts were deposited over WSe2: MoS2 nanocomposite by means of thermal evaporation unit. The proposed photodetector exhibits a broad photo response with maximum responsivity \u0000<inline-formula> <tex-math>$text {R}_{text {S}}$ </tex-math></inline-formula>\u0000(A/W) of 10.75 A/W, 85.45 A/W, and 146.96 A/W; at 350nm (UV), 750nm (visible) and 900nm (IR) at -1V bias. The nanocomposite shows promising characteristics for optoelectronic application. WSe2:MoS2 NC shows a wide absorbance spectra, covering ultraviolet (UV)-visible-near infrared (NIR) regions.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1101-1104"},"PeriodicalIF":2.3,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-12DOI: 10.1109/LPT.2024.3442251
Liming Qian;Jingfei Ye;Shixin Pei;Gaige Zheng
Stacked epsilon-near-zero (ENZ)/insulator/ENZ nanocavity has recently emerged as a promising platform to study and engineer mid-infrared (MIR) absorption and emission, as they can be realized by lithography-free fabrication process with fine control on the optical and geometrical parameters. Using Weyl semimetal (WSM) thin film as nonreciprocal materials, we study the absorption, emission and nonreciprocity enhancement induced by a specifically tailored ENZ/WSM/ENZ structure. The nonreciprocity equals to 0.987 with a resonant wavelength of $9~mu m$ , which confirms an obvious violation of Kirchhoff’s law. We also discuss the possibility of tailoring the magnitude and sign of nonreciprocity within the MIR spectrum simply by finely designing the thickness of each layer in the stack. The presented unpatterned configuration and broad tunability of high-quality resonance can work for a wide range of incidence angles, making such proposal with great potential for thermal scavenging and conversion.
{"title":"Planar Epsilon-Near-Zero Cavity for Nonreciprocity of Thermal Radiation Enhancement","authors":"Liming Qian;Jingfei Ye;Shixin Pei;Gaige Zheng","doi":"10.1109/LPT.2024.3442251","DOIUrl":"https://doi.org/10.1109/LPT.2024.3442251","url":null,"abstract":"Stacked epsilon-near-zero (ENZ)/insulator/ENZ nanocavity has recently emerged as a promising platform to study and engineer mid-infrared (MIR) absorption and emission, as they can be realized by lithography-free fabrication process with fine control on the optical and geometrical parameters. Using Weyl semimetal (WSM) thin film as nonreciprocal materials, we study the absorption, emission and nonreciprocity enhancement induced by a specifically tailored ENZ/WSM/ENZ structure. The nonreciprocity equals to 0.987 with a resonant wavelength of \u0000<inline-formula> <tex-math>$9~mu m$ </tex-math></inline-formula>\u0000, which confirms an obvious violation of Kirchhoff’s law. We also discuss the possibility of tailoring the magnitude and sign of nonreciprocity within the MIR spectrum simply by finely designing the thickness of each layer in the stack. The presented unpatterned configuration and broad tunability of high-quality resonance can work for a wide range of incidence angles, making such proposal with great potential for thermal scavenging and conversion.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"36 18","pages":"1113-1116"},"PeriodicalIF":2.3,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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