Pub Date : 2024-06-11DOI: 10.1088/2040-8986/ad52a0
Farhan Ali, Ramin Yazdaanpanah, Serap Aksu
We present a theoretical analysis aimed at comprehending and mitigating the focal shift phenomenon in planar dielectric metalenses. To conduct this analysis, we introduce metalens designs consisting of silicon and germanium nanoblocks on a calcium fluoride substrate, operating in the mid-IR frequency range. The lensing performance of these metalenses is investigated using the finite-difference time-domain method, and they operate at wavelengths of 3 and 4 µm with a polarization conversion efficiency close to unity. Our findings indicate a strong correlation between the focal shift phenomena on dielectric metalenses and the numerical aperture (NA), revealing that increasing the Fresnel number is not always an effective approach to minimizing the focal shift. In contrast to previous studies, we define a critical NA, independent of the lens size, where the focal shift reaches a minimum, resulting in a symmetric focal intensity distribution and ultimately yielding a better-performing metalens. We demonstrate that for NAs greater than the determined critical value, a positive focal shift is observed on planar metalenses, diverging from the conventional negative shift predicted by existing models. Additionally, we show that by selecting a metalens within a specific NA range and with smaller diameters, high focusing efficiencies can be achieved. The focusing efficiency of the studied metalenses is measured as high as 70%, marking one of the best values reported for the IR range to date. These results serve as a guide for improving the agreement between experimental and designed metalens features, enhancing their practical applications.
我们提出了一项理论分析，旨在理解和缓解平面电介质金属透镜中的焦距偏移现象。为了进行这一分析，我们介绍了由氟化钙基底上的硅和锗纳米块组成的金属透镜设计，工作在中红外频率范围。我们使用有限差分时域法研究了这些金属透镜的透镜性能，它们在波长为 3 和 4 µm 的波段工作，偏振转换效率接近于 1。我们的研究结果表明，介电金属透镜上的焦移现象与数值孔径（NA）之间存在很强的相关性，揭示了增加菲涅尔数并不总是最小化焦移的有效方法。与以往的研究不同，我们定义了一个与透镜尺寸无关的临界 NA 值，在该值下，焦距偏移达到最小值，从而形成对称的焦距强度分布，最终产生性能更好的金属透镜。我们证明，当 NA 大于确定的临界值时，平面金属透镜上会出现正焦距偏移，这与现有模型预测的传统负偏移不同。此外，我们还证明，通过在特定 NA 范围内选择直径较小的金属透镜，可以实现较高的聚焦效率。据测量，所研究的金属透镜的聚焦效率高达 70%，是迄今为止在红外范围内报告的最佳值之一。这些结果为提高实验和设计金属透镜特征之间的一致性提供了指导，从而增强了它们的实际应用。
{"title":"Tackling the focal shift effect for metalenses","authors":"Farhan Ali, Ramin Yazdaanpanah, Serap Aksu","doi":"10.1088/2040-8986/ad52a0","DOIUrl":"https://doi.org/10.1088/2040-8986/ad52a0","url":null,"abstract":"We present a theoretical analysis aimed at comprehending and mitigating the focal shift phenomenon in planar dielectric metalenses. To conduct this analysis, we introduce metalens designs consisting of silicon and germanium nanoblocks on a calcium fluoride substrate, operating in the mid-IR frequency range. The lensing performance of these metalenses is investigated using the finite-difference time-domain method, and they operate at wavelengths of 3 and 4 <italic toggle=\"yes\">µ</italic>m with a polarization conversion efficiency close to unity. Our findings indicate a strong correlation between the focal shift phenomena on dielectric metalenses and the numerical aperture (NA), revealing that increasing the Fresnel number is not always an effective approach to minimizing the focal shift. In contrast to previous studies, we define a critical NA, independent of the lens size, where the focal shift reaches a minimum, resulting in a symmetric focal intensity distribution and ultimately yielding a better-performing metalens. We demonstrate that for NAs greater than the determined critical value, a positive focal shift is observed on planar metalenses, diverging from the conventional negative shift predicted by existing models. Additionally, we show that by selecting a metalens within a specific NA range and with smaller diameters, high focusing efficiencies can be achieved. The focusing efficiency of the studied metalenses is measured as high as 70%, marking one of the best values reported for the IR range to date. These results serve as a guide for improving the agreement between experimental and designed metalens features, enhancing their practical applications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"14 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529385","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 : 2024-05-21DOI: 10.1088/2040-8986/ad4727
Kartika N Nimje, Maxime Giteau and Georgia T Papadakis
A thermophotovoltaic (TPV) energy converter harnesses thermal photons emitted by a hot body and converts them to electricity. When the radiative heat exchange between the emitter and photovoltaic cell is spectrally monochromatic, the TPV system can approach the Carnot thermodynamic efficiency limit. Nonetheless, this occurs at the expense of vanishing extracted electrical power density. Conversely, a spectrally broadband radiative heat exchange between the emitter and the cell yields maximal TPV power density at the expense of low efficiency. By leveraging hot-carriers as a means to mitigate thermalization losses within the cell, we demonstrate that one can alleviate this trade-off between power density and efficiency. Via detailed balance analysis, we show analytically that one can reach near-Carnot conversion efficiencies close to the maximum power point, which is unattainable with conventional TPV systems. We derive analytical relations between intrinsic device parameters and performance metrics, which serve as design rules for hot-carrier-based TPV systems.
{"title":"Hot-carrier thermophotovoltaic systems","authors":"Kartika N Nimje, Maxime Giteau and Georgia T Papadakis","doi":"10.1088/2040-8986/ad4727","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4727","url":null,"abstract":"A thermophotovoltaic (TPV) energy converter harnesses thermal photons emitted by a hot body and converts them to electricity. When the radiative heat exchange between the emitter and photovoltaic cell is spectrally monochromatic, the TPV system can approach the Carnot thermodynamic efficiency limit. Nonetheless, this occurs at the expense of vanishing extracted electrical power density. Conversely, a spectrally broadband radiative heat exchange between the emitter and the cell yields maximal TPV power density at the expense of low efficiency. By leveraging hot-carriers as a means to mitigate thermalization losses within the cell, we demonstrate that one can alleviate this trade-off between power density and efficiency. Via detailed balance analysis, we show analytically that one can reach near-Carnot conversion efficiencies close to the maximum power point, which is unattainable with conventional TPV systems. We derive analytical relations between intrinsic device parameters and performance metrics, which serve as design rules for hot-carrier-based TPV systems.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"20 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147619","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 : 2024-05-19DOI: 10.1088/2040-8986/ad44ab
Tian Ma, Jiangkun Tian, Wei Sang, Doudou Wang and Jun Li
Chiral metasurfaces have attracted considerable attention because of their immense potential for diverse applications requiring chiral light-matter interactions. Recently, boosted by a mechanism based on the concept of bound states in the continuum (BICs), high Q factor chiroptical resonances have been exhibited by breaking the inversion symmetries of planar metasurfaces. However, the optical chirality of these chiral metasurfaces is generally intolerable with respect to the structural geometries, especially the geometric asymmetry. Here, we present a novel chiral quasi-BIC with strong optical chirality in an all-dielectric metasurface. By simultaneously breaking the in-plane rotational and mirror symmetries, the chiral metasurface shows enhanced chiroptical resonances with near-unity CD (∼0.996) and high Q factors (∼2274) at terahertz frequencies. Further analyses based on numerical simulations reveal that the CD of the chiroptical resonance depicts exceptional remarkable tolerableness to the geometry asymmetry when are present in a broad range, while the corresponding Q factor is modulated accordingly. The results may develop a novel approach to manipulating the advanced optical chirality for potential applications requiring strong CD with enhanced light-matter interactions.
手性元表面因其在需要手性光物质相互作用的各种应用中的巨大潜力而备受关注。最近，在基于连续体中束缚态（BICs）概念的机制推动下，通过打破平面元表面的反转对称性，表现出了高 Q 因子的手性共振。然而，这些手性元表面的光学手性通常无法忍受结构几何，尤其是几何不对称。在这里，我们提出了一种在全介电元表面中具有强光学手性的新型手性准 BIC。通过同时打破平面内旋转对称性和镜像对称性，手性元表面在太赫兹频率下显示出增强的气色共振，具有接近统一的 CD（∼0.996）和高 Q 因子（∼2274）。基于数值模拟的进一步分析表明，当存在大范围的几何不对称时，千光共振的 CD 对几何不对称具有非凡的容忍性，而相应的 Q 因子也会相应地发生调制。这些结果可能会开发出一种操纵先进光学手性的新方法，用于需要强 CD 和增强光物质相互作用的潜在应用。
{"title":"High Q chiroptical responses with maximum chirality in all-dielectric metasurfaces driven by quasi-bound states in the continuum","authors":"Tian Ma, Jiangkun Tian, Wei Sang, Doudou Wang and Jun Li","doi":"10.1088/2040-8986/ad44ab","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44ab","url":null,"abstract":"Chiral metasurfaces have attracted considerable attention because of their immense potential for diverse applications requiring chiral light-matter interactions. Recently, boosted by a mechanism based on the concept of bound states in the continuum (BICs), high Q factor chiroptical resonances have been exhibited by breaking the inversion symmetries of planar metasurfaces. However, the optical chirality of these chiral metasurfaces is generally intolerable with respect to the structural geometries, especially the geometric asymmetry. Here, we present a novel chiral quasi-BIC with strong optical chirality in an all-dielectric metasurface. By simultaneously breaking the in-plane rotational and mirror symmetries, the chiral metasurface shows enhanced chiroptical resonances with near-unity CD (∼0.996) and high Q factors (∼2274) at terahertz frequencies. Further analyses based on numerical simulations reveal that the CD of the chiroptical resonance depicts exceptional remarkable tolerableness to the geometry asymmetry when are present in a broad range, while the corresponding Q factor is modulated accordingly. The results may develop a novel approach to manipulating the advanced optical chirality for potential applications requiring strong CD with enhanced light-matter interactions.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"35 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147590","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 : 2024-05-16DOI: 10.1088/2040-8986/ad4722
Yujie Luo, Thomas Christensen and Ognjen Ilic
Active nanophotonic materials that can emulate and adapt between many different spectral profiles—with high fidelity and over a broad bandwidth—could have a far-reaching impact, but are challenging to design due to a high-dimensional and complex design space. Here, we show that a metamaterial network of coupled 2D-material nanoresonators in graphene can adaptively match multiple complex absorption spectra via a set of input voltages. To design such networks, we develop a semi-analytical auto-differentiable dipole-coupled model that allows scalable optimization of high-dimensional networks with many elements and voltage signals. As a demonstration of multi-spectral capability, we design a single network capable of mimicking four spectral targets resembling select gases (nitric oxide, nitrogen dioxide, methane, nitrous oxide) with very high fidelity ( ). Our results could impact the design of highly reconfigurable optical materials and platforms for applications in sensing, communication and display technology, and signature and thermal management.
{"title":"Adaptive multi-spectral mimicking with 2D-material nanoresonator networks","authors":"Yujie Luo, Thomas Christensen and Ognjen Ilic","doi":"10.1088/2040-8986/ad4722","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4722","url":null,"abstract":"Active nanophotonic materials that can emulate and adapt between many different spectral profiles—with high fidelity and over a broad bandwidth—could have a far-reaching impact, but are challenging to design due to a high-dimensional and complex design space. Here, we show that a metamaterial network of coupled 2D-material nanoresonators in graphene can adaptively match multiple complex absorption spectra via a set of input voltages. To design such networks, we develop a semi-analytical auto-differentiable dipole-coupled model that allows scalable optimization of high-dimensional networks with many elements and voltage signals. As a demonstration of multi-spectral capability, we design a single network capable of mimicking four spectral targets resembling select gases (nitric oxide, nitrogen dioxide, methane, nitrous oxide) with very high fidelity ( ). Our results could impact the design of highly reconfigurable optical materials and platforms for applications in sensing, communication and display technology, and signature and thermal management.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"66 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141059272","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 : 2024-05-14DOI: 10.1088/2040-8986/ad4724
Shijie Dong, Yunzhe Yang, Yujie Zhou, Xinzhong Li and Miaomiao Tang
We introduce a new class of twisted sources with twisted cosine-Gaussian Schell-model correlation structure. The spectral intensity and the degree of coherence of the field upon propagation are discussed. Such novel twisted field is characterized by unfamiliar twist pattern and controllable far-zone lattice profile. It exhibits a Gaussian or a lattice-like intensity distribution in the source plane, while always turns into a lattice profile in the far zone. Notably, the array profile twists around the propagation axis instead of each element rotating about its own lobe center, which is different from most of the twisted array models. Moreover, the splitting tendency in the intensity distribution could be flexibly modulated by the twisted factor, the source coherence and the beam width. The coherence distribution could rotate in the same direction as the intensity with appropriate choice of parameters. Finally, the cross-spectral density’s phase distribution exhibits a spiral windmill structure and coherent singularities could be observed upon propagation.
{"title":"Propagation characteristics of twisted cosine-Gaussian Schell-model beams","authors":"Shijie Dong, Yunzhe Yang, Yujie Zhou, Xinzhong Li and Miaomiao Tang","doi":"10.1088/2040-8986/ad4724","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4724","url":null,"abstract":"We introduce a new class of twisted sources with twisted cosine-Gaussian Schell-model correlation structure. The spectral intensity and the degree of coherence of the field upon propagation are discussed. Such novel twisted field is characterized by unfamiliar twist pattern and controllable far-zone lattice profile. It exhibits a Gaussian or a lattice-like intensity distribution in the source plane, while always turns into a lattice profile in the far zone. Notably, the array profile twists around the propagation axis instead of each element rotating about its own lobe center, which is different from most of the twisted array models. Moreover, the splitting tendency in the intensity distribution could be flexibly modulated by the twisted factor, the source coherence and the beam width. The coherence distribution could rotate in the same direction as the intensity with appropriate choice of parameters. Finally, the cross-spectral density’s phase distribution exhibits a spiral windmill structure and coherent singularities could be observed upon propagation.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"64 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940347","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 : 2024-05-14DOI: 10.1088/2040-8986/ad4728
Nguyen Van Phu, Nguyen Huy Bang, Luong Thi Yen Nga and Le Van Doai
The optical response of a magnetic-degenerated four-level atom system to the two left and right circular polarization components of the probe field is represented at room temperature. The absorption spectrum and group index for the two polarization components of the probe field are controlled according to the static magnetic field and the coupling field under electromagnetically induced transparency condition. By varying the strength of the static magnetic field, the optical response of the atomic medium can be changed from transparency to absorption or vice versa and hence the amplitude of group index also changes from positive extreme to negative extreme or vice versa. The same phenomenon also occurs when changing the coupling field intensity. In addition, temperature also significantly influence on the optical response of the atomic medium, which changes not only the amplitude but also the sign of the group index as the temperature increases. Our analytical results can be useful for experimental observation and related applications of light group index/velocity at room temperature.
{"title":"Switching between slow light and fast light by static magnetic field in a degenerate four-level atomic system at room temperature","authors":"Nguyen Van Phu, Nguyen Huy Bang, Luong Thi Yen Nga and Le Van Doai","doi":"10.1088/2040-8986/ad4728","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4728","url":null,"abstract":"The optical response of a magnetic-degenerated four-level atom system to the two left and right circular polarization components of the probe field is represented at room temperature. The absorption spectrum and group index for the two polarization components of the probe field are controlled according to the static magnetic field and the coupling field under electromagnetically induced transparency condition. By varying the strength of the static magnetic field, the optical response of the atomic medium can be changed from transparency to absorption or vice versa and hence the amplitude of group index also changes from positive extreme to negative extreme or vice versa. The same phenomenon also occurs when changing the coupling field intensity. In addition, temperature also significantly influence on the optical response of the atomic medium, which changes not only the amplitude but also the sign of the group index as the temperature increases. Our analytical results can be useful for experimental observation and related applications of light group index/velocity at room temperature.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"5 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940170","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 : 2024-05-13DOI: 10.1088/2040-8986/ad4725
Jianhe Yang and Shaohua Tao
Polarization state, as one of the fundamental properties of light fields, has found widespread applications across various domains. The control of intensity, phase, and polarization state along the direction of beam propagation has opened up new avenues for beams. In this work, we generated a beam in which different intensities, phases, and polarization states can simultaneously appear at different positions along the direction of beam propagation. In other words, varied intensities, phases, and polarization states can coexist in the direction of beam propagation. The correctness of this method is validated through theoretical analysis and experimental results. This approach expands the application scope of light beams and provides a favorable path for exploring the optical characteristics of beams.
{"title":"Coexistence of varied intensities, phases, and polarization states along the direction of beam propagation","authors":"Jianhe Yang and Shaohua Tao","doi":"10.1088/2040-8986/ad4725","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4725","url":null,"abstract":"Polarization state, as one of the fundamental properties of light fields, has found widespread applications across various domains. The control of intensity, phase, and polarization state along the direction of beam propagation has opened up new avenues for beams. In this work, we generated a beam in which different intensities, phases, and polarization states can simultaneously appear at different positions along the direction of beam propagation. In other words, varied intensities, phases, and polarization states can coexist in the direction of beam propagation. The correctness of this method is validated through theoretical analysis and experimental results. This approach expands the application scope of light beams and provides a favorable path for exploring the optical characteristics of beams.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"31 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940163","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 : 2024-05-13DOI: 10.1088/2040-8986/ad4726
Na Pei, Bao-Fei Wan, Sun-Xin Xie, Ting-Hao Zhang and Hai-Feng Zhang
This paper delves into the one-dimensional photonic crystals (PCs) privacy protection structure (PPS), emphasizing a layered structure with polarization-independent angular response characteristics tailored to meet the need for PPS in various situations. Introducing a specialized design for photonic band gap (PBG), the PPS adheres to the principles of PBG. This design comprises a host structure and an anti-reflection structure carefully selected within the yellow light band (frequency range spans from 530 THz to 510 THz). The given PPS creates an angle selection (AS) window exhibiting transmittance consistently above 0.85 within −29° to 29° while ensuring transmittance drops to 0.1 within the −90° to −46° and 46°–90° range. This arrangement effectively achieves the desired PPS. The effects of the host structure on the four key parameters of refractive index and thickness of the two media on PPS properties were studied in detail. The influence of these parameters mainly involves the transmittance of the visible area, the AS, and the transmittance of the protected area.
{"title":"Yellow light privacy protection with anti-reflection structure based on photonic band gap principle","authors":"Na Pei, Bao-Fei Wan, Sun-Xin Xie, Ting-Hao Zhang and Hai-Feng Zhang","doi":"10.1088/2040-8986/ad4726","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4726","url":null,"abstract":"This paper delves into the one-dimensional photonic crystals (PCs) privacy protection structure (PPS), emphasizing a layered structure with polarization-independent angular response characteristics tailored to meet the need for PPS in various situations. Introducing a specialized design for photonic band gap (PBG), the PPS adheres to the principles of PBG. This design comprises a host structure and an anti-reflection structure carefully selected within the yellow light band (frequency range spans from 530 THz to 510 THz). The given PPS creates an angle selection (AS) window exhibiting transmittance consistently above 0.85 within −29° to 29° while ensuring transmittance drops to 0.1 within the −90° to −46° and 46°–90° range. This arrangement effectively achieves the desired PPS. The effects of the host structure on the four key parameters of refractive index and thickness of the two media on PPS properties were studied in detail. The influence of these parameters mainly involves the transmittance of the visible area, the AS, and the transmittance of the protected area.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"46 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940343","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 : 2024-05-12DOI: 10.1088/2040-8986/ad4613
Valeria Rodríguez-Fajardo, Fernanda Arvizu, Dayver Daza-Salgado, Benjamin Perez-Garcia and Carmelo Rosales-Guzmán
We propose a technique to generate complex vector beams with high quality and stability. Our approach relies on the combination of complex amplitude modulation (CAM) and on-axis modulation, two techniques that seem incompatible at first glance. The first one produces scalar structured light fields in phase and amplitude with high accuracy, while the second one is preferred for generating vector beams of great stability although of reduced quality. Specifically, the idea behind our technique is to send the shaped light produced by CAM co-axially with the zeroth order, rather than diffracted to the first order, as it is commonly done. We first describe our technique, explaining the generation of the hologram and experimental setup to isolate the desired vector mode, and then present experimental results that corroborate our approach. We first address the quality of the generated beams using Stokes polarimetry to reconstruct their transverse polarisation distribution, and then compare their stability against the same mode produced using a Sagnac interferometric method. Our vector beams are of good quality and remarkably stable, two qualities that we expect will appeal to the community working with vector modes.
{"title":"On-axis complex-amplitude modulation for the generation of super-stable vector modes","authors":"Valeria Rodríguez-Fajardo, Fernanda Arvizu, Dayver Daza-Salgado, Benjamin Perez-Garcia and Carmelo Rosales-Guzmán","doi":"10.1088/2040-8986/ad4613","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4613","url":null,"abstract":"We propose a technique to generate complex vector beams with high quality and stability. Our approach relies on the combination of complex amplitude modulation (CAM) and on-axis modulation, two techniques that seem incompatible at first glance. The first one produces scalar structured light fields in phase and amplitude with high accuracy, while the second one is preferred for generating vector beams of great stability although of reduced quality. Specifically, the idea behind our technique is to send the shaped light produced by CAM co-axially with the zeroth order, rather than diffracted to the first order, as it is commonly done. We first describe our technique, explaining the generation of the hologram and experimental setup to isolate the desired vector mode, and then present experimental results that corroborate our approach. We first address the quality of the generated beams using Stokes polarimetry to reconstruct their transverse polarisation distribution, and then compare their stability against the same mode produced using a Sagnac interferometric method. Our vector beams are of good quality and remarkably stable, two qualities that we expect will appeal to the community working with vector modes.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"44 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940169","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 : 2024-05-12DOI: 10.1088/2040-8986/ad44a9
Gabriel Sanderson, Ze Zheng, Elizaveta Melik-Gaykazyan, George S D Gordon, Richard Cousins, Cuifeng Ying, Mohsen Rahmani and Lei Xu
Nonlinear light-matter interactions have emerged as a promising platform for various applications, including imaging, nanolasing, background-free sensing, etc. Subwavelength dielectric resonators offer unique opportunities for manipulating light at the nanoscale and miniturising optical elements. Here, we explore the resonantly enhanced four-wave mixing (FWM) process from individual silicon resonators and propose an innovative FWM-enabled infrared imaging technique that leverages the capabilities of these subwavelength resonators. Specifically, we designed high-Q silicon resonators hosting dual quasi-bound states in the continuum at both the input pump and signal beams, enabling efficient conversion of infrared light to visible radiation. Moreover, by employing a point-scanning imaging technique, we achieve infrared imaging conversion while minimising the dependence on high-power input sources. This combination of resonant enhancement and point-scanning imaging opens up new possibilities for nonlinear imaging using individual resonators and shows potential in advancing infrared imaging techniques for high-resolution imaging, sensing, and optical communications.
{"title":"Infrared imaging with nonlinear silicon resonator governed by high-Q quasi-BIC states","authors":"Gabriel Sanderson, Ze Zheng, Elizaveta Melik-Gaykazyan, George S D Gordon, Richard Cousins, Cuifeng Ying, Mohsen Rahmani and Lei Xu","doi":"10.1088/2040-8986/ad44a9","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44a9","url":null,"abstract":"Nonlinear light-matter interactions have emerged as a promising platform for various applications, including imaging, nanolasing, background-free sensing, etc. Subwavelength dielectric resonators offer unique opportunities for manipulating light at the nanoscale and miniturising optical elements. Here, we explore the resonantly enhanced four-wave mixing (FWM) process from individual silicon resonators and propose an innovative FWM-enabled infrared imaging technique that leverages the capabilities of these subwavelength resonators. Specifically, we designed high-Q silicon resonators hosting dual quasi-bound states in the continuum at both the input pump and signal beams, enabling efficient conversion of infrared light to visible radiation. Moreover, by employing a point-scanning imaging technique, we achieve infrared imaging conversion while minimising the dependence on high-power input sources. This combination of resonant enhancement and point-scanning imaging opens up new possibilities for nonlinear imaging using individual resonators and shows potential in advancing infrared imaging techniques for high-resolution imaging, sensing, and optical communications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"24 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940167","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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