Igor R. Krylov, Uliana V. Prokhorova, Vasiliy A. Stolyarov, Ekaterina A. Efremova, A. A. Zinchik, E. Shalymov, V. Shoev, Dmitriy V. Masygin, Vladimir Y. Venediktov
The paper investigates the resonances of reflection (transmission) of a structure consisting of two optically coupled subwavelength silicon rectangular diffraction gratings, separated by a layer of optically transparent dielectric. The considered structure combines gain, loss and optical coupling coefficient of the periodic structure to effectively operate in parity-time symmetry mode. The spectral characteristics of the resonant reflection (transmission) of the metastructure are analyzed both in PT-symmetry mode and when switching the system to broken PT-symmetry mode. The advantages and disadvantages of using optical parity-time symmetry to control resonant reflection (transmission) for TM- and TEpolarized light incidence are demonstrated. It is shown that changing the relative arrangement of the gain and loss gratings with respect to the incident signal field significantly affects the ratio of transmission and reflection coefficients. All results are obtained considering the dispersion of the materials used.
本文研究了一种由两个光耦合亚波长硅矩形衍射光栅组成的结构的反射（透射）共振，该结构由一层光学透明电介质隔开。所考虑的结构结合了周期性结构的增益、损耗和光耦合系数，能有效地在奇偶时对称模式下工作。在 PT 对称模式下和将系统切换到断开的 PT 对称模式时，都分析了元结构的谐振反射（透射）光谱特性。演示了使用光学奇偶-时间对称性来控制 TM 和 TE 偏振光入射的谐振反射（透射）的优缺点。研究表明，改变增益光栅和损耗光栅相对于入射信号场的相对排列方式，会显著影响透射系数和反射系数的比值。所有结果都是在考虑所用材料的色散情况下得出的。
{"title":"Parity-time symmetry mode of coupled subwavelength silicon rectangular gratings","authors":"Igor R. Krylov, Uliana V. Prokhorova, Vasiliy A. Stolyarov, Ekaterina A. Efremova, A. A. Zinchik, E. Shalymov, V. Shoev, Dmitriy V. Masygin, Vladimir Y. Venediktov","doi":"10.1117/12.2687284","DOIUrl":"https://doi.org/10.1117/12.2687284","url":null,"abstract":"The paper investigates the resonances of reflection (transmission) of a structure consisting of two optically coupled subwavelength silicon rectangular diffraction gratings, separated by a layer of optically transparent dielectric. The considered structure combines gain, loss and optical coupling coefficient of the periodic structure to effectively operate in parity-time symmetry mode. The spectral characteristics of the resonant reflection (transmission) of the metastructure are analyzed both in PT-symmetry mode and when switching the system to broken PT-symmetry mode. The advantages and disadvantages of using optical parity-time symmetry to control resonant reflection (transmission) for TM- and TEpolarized light incidence are demonstrated. It is shown that changing the relative arrangement of the gain and loss gratings with respect to the incident signal field significantly affects the ratio of transmission and reflection coefficients. All results are obtained considering the dispersion of the materials used.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"168 1","pages":"127730T - 127730T-8"},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yifei Gao, Zhenyu Xu, Zilin Jiang, Natalie Earnhardt, D. Kotsifaki
In this work, we have identified the size of microplastics collected from Shi Lake, China, using an optical tweezer micro-Raman spectroscopy (OTMRS) system. The microplastics were classified based on their size as products of degradation of large plastic material. Most of them were in the sub-20 μm regime. On the other hand, as nanoplastics may be more extensively distributed and hazardous than larger-sized plastics, their detection is a key point. Thus, we have designed a planar metamaterial structure and have studied the near-field enhancement in order to detect and analyze nanoplastics in aquatic environments with high sensitivity and selectivity. This study paves a way to improve our knowledge of small plastics abundance and pollution in freshwater around Shi Lake.
{"title":"Plasmonic nanostructures for environmental monitoring and/or biological applications","authors":"Yifei Gao, Zhenyu Xu, Zilin Jiang, Natalie Earnhardt, D. Kotsifaki","doi":"10.1117/12.2689048","DOIUrl":"https://doi.org/10.1117/12.2689048","url":null,"abstract":"In this work, we have identified the size of microplastics collected from Shi Lake, China, using an optical tweezer micro-Raman spectroscopy (OTMRS) system. The microplastics were classified based on their size as products of degradation of large plastic material. Most of them were in the sub-20 μm regime. On the other hand, as nanoplastics may be more extensively distributed and hazardous than larger-sized plastics, their detection is a key point. Thus, we have designed a planar metamaterial structure and have studied the near-field enhancement in order to detect and analyze nanoplastics in aquatic environments with high sensitivity and selectivity. This study paves a way to improve our knowledge of small plastics abundance and pollution in freshwater around Shi Lake.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"42 1","pages":"127740J - 127740J-4"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139210818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuchen Wang, Wei Qiu, Lu Chen, Chengchen Bi, Xiaoyun Jiang, Leiming Zhou, Yuwei Fang, Jigang Hu
Here we have investigated the strong coupling of the guided modes with different orders in graphene-based onedimensional (1D) dielectric grating structures in the visible wavelengths. We found that the guided mode resonances (GMR) with different orders can strongly couple with each other under the oblique incidence of light. Absorption spectral response exhibits a distinct spectral anti-crossing with the Rabi splitting up to 59.8 meV. Simulation results further show that the strong coupling of GMR modes enables the bound state in the continuum (BIC) in this coupled system, which can be flexibly modulated by adjusting structural parameters. The proposed hybrid grating structures will benefit the applications in on-chip optical filtering, sensing, and optoelectronic detection.
{"title":"Strong coupling of the guided modes with BIC generation in graphene-based one-dimensional dielectric gratings","authors":"Yuchen Wang, Wei Qiu, Lu Chen, Chengchen Bi, Xiaoyun Jiang, Leiming Zhou, Yuwei Fang, Jigang Hu","doi":"10.1117/12.2687502","DOIUrl":"https://doi.org/10.1117/12.2687502","url":null,"abstract":"Here we have investigated the strong coupling of the guided modes with different orders in graphene-based onedimensional (1D) dielectric grating structures in the visible wavelengths. We found that the guided mode resonances (GMR) with different orders can strongly couple with each other under the oblique incidence of light. Absorption spectral response exhibits a distinct spectral anti-crossing with the Rabi splitting up to 59.8 meV. Simulation results further show that the strong coupling of GMR modes enables the bound state in the continuum (BIC) in this coupled system, which can be flexibly modulated by adjusting structural parameters. The proposed hybrid grating structures will benefit the applications in on-chip optical filtering, sensing, and optoelectronic detection.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"45 1","pages":"127740O - 127740O-6"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139211759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Demishkevich, Andrey Y. Zyubin, Vladimir Rafalskiy, Svetlana Doktorova, A. Kundalevich, Alexander Zozulya, Denis Evtifeev, Ilya Samusev
This study demonstrates the possibility of the surface enhanced Raman spectroscopy (SERS) method to determine concentrations of methotrexate (MTX) in human plasma. This method makes it possible to detect low concentrations of methotrexate in biological samples with relatively inexpensive portable equipment. The SERS signal may be greatly enhanced using nanostructured plasmonic materials which will make this method highly sensitive, selective and productive. The use of SERS to perform a therapeutic drug monitoring procedure is a promising method because of its extreme sensitivity, specificity and speed of analysis.
{"title":"Application of SERS method for detection of methotrexate molecules in human plasma","authors":"E. Demishkevich, Andrey Y. Zyubin, Vladimir Rafalskiy, Svetlana Doktorova, A. Kundalevich, Alexander Zozulya, Denis Evtifeev, Ilya Samusev","doi":"10.1117/12.2689134","DOIUrl":"https://doi.org/10.1117/12.2689134","url":null,"abstract":"This study demonstrates the possibility of the surface enhanced Raman spectroscopy (SERS) method to determine concentrations of methotrexate (MTX) in human plasma. This method makes it possible to detect low concentrations of methotrexate in biological samples with relatively inexpensive portable equipment. The SERS signal may be greatly enhanced using nanostructured plasmonic materials which will make this method highly sensitive, selective and productive. The use of SERS to perform a therapeutic drug monitoring procedure is a promising method because of its extreme sensitivity, specificity and speed of analysis.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"12 1","pages":"127740C - 127740C-3"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139209200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Igor Y. Nikitin, Ksenia Maleeva, Daria A. Kafeeva, Alexey V. Nashyokin, Igor A. Gladskikh
A new approach to making silver colloid nanoparticle based SERS substrates has been demonstrated. A self-assembled silver film with plasmon resonance has been obtained by self-assembly. Four-valent ammonium salts have been used as coordinating molecules. The method is simple and does not involve complicated machinery or difficult mask making techniques that are used to fabricate SERS substrates today. It involves mixing the tetraoctylammonium bromide or tetrabutylammonium nitrate with hexane and silver nanoparticle water colloid solution in one vial, shaking it to obtain a monolayer film on hexane surface and just pouring it onto the cleaned substrate. The anodic alumina barrier layer has been used to induce more uniform self-assembly of colloid films. This SERS structure can be used in conventional plasmonics, sensors and medical applications
{"title":"Self-assembled plasmonic silver nanoparticle films on anodic alumina for SERS applications","authors":"Igor Y. Nikitin, Ksenia Maleeva, Daria A. Kafeeva, Alexey V. Nashyokin, Igor A. Gladskikh","doi":"10.1117/12.2686292","DOIUrl":"https://doi.org/10.1117/12.2686292","url":null,"abstract":"A new approach to making silver colloid nanoparticle based SERS substrates has been demonstrated. A self-assembled silver film with plasmon resonance has been obtained by self-assembly. Four-valent ammonium salts have been used as coordinating molecules. The method is simple and does not involve complicated machinery or difficult mask making techniques that are used to fabricate SERS substrates today. It involves mixing the tetraoctylammonium bromide or tetrabutylammonium nitrate with hexane and silver nanoparticle water colloid solution in one vial, shaking it to obtain a monolayer film on hexane surface and just pouring it onto the cleaned substrate. The anodic alumina barrier layer has been used to induce more uniform self-assembly of colloid films. This SERS structure can be used in conventional plasmonics, sensors and medical applications","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"16 1","pages":"127740D - 127740D-9"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139211770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current research proposes the development of a plasmonic elliptical ring resonator structure with a Metal (Ag) Insulator Metal (Ag) waveguide configuration for the purpose of bio sensing. The research involves a distinctive exploration of the sensitivity and peak resonance wavelength, which are found to be varied by altering the aspect ratio of the elliptical ring resonator. The results reveal a marked increase in sensitivity, ranging from 732.60 nm/RIU to 1113.70nm/RIU, by changing the aspect ratio (ratio of major to minor radius of elliptical ring resonator) from 1.61 to 3.72. Furthermore, these adjustments produce a noticeable redshift in the peak resonance wavelength, as the aspect ratio increases. The study also highlights the impact of other geometrical factors of the sensor on its sensing characteristics. It is found that sensitivity changes significantly with the change in width of resonator and linear waveguide, and it is found to be decreased when width increases. The results of variation in width of waveguides reveals that there occurs a red shift in resonance wavelength when width decrease and vice versa. Based on the finding of all significant geometrical factors an optimized structure is selected with the optimum value of sensitivity. Which evidences its suitability for biosensing purpose and with its superior capabilities, the sensor can play a crucial role in distinguishing between healthy and cancerous cell and will be helpful in detecting cancer at early stage. The investigation and observations involved in the process are computed numerically using the finite difference in time domain method (FDTD).
{"title":"Analysis of sensing characteristics of plasmonic elliptical ring resonator based refractive index sensor","authors":"Rahul Pandey, Rukhsar Zafar, Santosh Kumar, Ghanshyam Singh, R. Mitharwal, Manisha Bharati","doi":"10.1117/12.2685380","DOIUrl":"https://doi.org/10.1117/12.2685380","url":null,"abstract":"The current research proposes the development of a plasmonic elliptical ring resonator structure with a Metal (Ag) Insulator Metal (Ag) waveguide configuration for the purpose of bio sensing. The research involves a distinctive exploration of the sensitivity and peak resonance wavelength, which are found to be varied by altering the aspect ratio of the elliptical ring resonator. The results reveal a marked increase in sensitivity, ranging from 732.60 nm/RIU to 1113.70nm/RIU, by changing the aspect ratio (ratio of major to minor radius of elliptical ring resonator) from 1.61 to 3.72. Furthermore, these adjustments produce a noticeable redshift in the peak resonance wavelength, as the aspect ratio increases. The study also highlights the impact of other geometrical factors of the sensor on its sensing characteristics. It is found that sensitivity changes significantly with the change in width of resonator and linear waveguide, and it is found to be decreased when width increases. The results of variation in width of waveguides reveals that there occurs a red shift in resonance wavelength when width decrease and vice versa. Based on the finding of all significant geometrical factors an optimized structure is selected with the optimum value of sensitivity. Which evidences its suitability for biosensing purpose and with its superior capabilities, the sensor can play a crucial role in distinguishing between healthy and cancerous cell and will be helpful in detecting cancer at early stage. The investigation and observations involved in the process are computed numerically using the finite difference in time domain method (FDTD).","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"5 1","pages":"1277406 - 1277406-8"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For an advanced three-dimensional (3D) light field display, the 3D image information with correct spatial occlusion relation should be provided in a large viewing angle range. However, the optical distortion and the structural error are two key factors of the deterioration in image quality, which cause the serious deformation of 3D images, especially in large viewing angle. Here, the light path of spatial voxel is analyzed. The mathematical relationship between optical system parameters and spatial voxel positions is achieved. The aberration theory is used to analyze the optical distortion of single lenses. Due to the influence of optical distortion, the angle of the emitted light deviates from the ideal direction, which leads to the deviation of spatial voxel positions. The compound lens with aperture-stop is designed to suppress the optical distortion. The optical performance of optimized compound lens is evaluated. In order to further suppress the residual optical distortion and the structural error, a pre-correction method with the detection of optical path error is proposed. The correspondence between the pixel of display source and the spatial voxel is obtained. Based on the designed compound lens and pre-correction encoded image, a 3D light field display system is constructed. Experimental results demonstrates that the proposed method suppresses the optical distortion and the structural error. An undeformed 3D image with the viewing angle above 100 degrees can be achieved, which can find potential applications in biomedical imaging and visualization to enhance medical analysis and diagnosis.
{"title":"High-performance 3D light field display based on distortion suppressed compound lens and pre-correction encoded image","authors":"Xinzhu Sang, Xudong Wen, Xin Gao, Xunbo Yu","doi":"10.1117/12.2688607","DOIUrl":"https://doi.org/10.1117/12.2688607","url":null,"abstract":"For an advanced three-dimensional (3D) light field display, the 3D image information with correct spatial occlusion relation should be provided in a large viewing angle range. However, the optical distortion and the structural error are two key factors of the deterioration in image quality, which cause the serious deformation of 3D images, especially in large viewing angle. Here, the light path of spatial voxel is analyzed. The mathematical relationship between optical system parameters and spatial voxel positions is achieved. The aberration theory is used to analyze the optical distortion of single lenses. Due to the influence of optical distortion, the angle of the emitted light deviates from the ideal direction, which leads to the deviation of spatial voxel positions. The compound lens with aperture-stop is designed to suppress the optical distortion. The optical performance of optimized compound lens is evaluated. In order to further suppress the residual optical distortion and the structural error, a pre-correction method with the detection of optical path error is proposed. The correspondence between the pixel of display source and the spatial voxel is obtained. Based on the designed compound lens and pre-correction encoded image, a 3D light field display system is constructed. Experimental results demonstrates that the proposed method suppresses the optical distortion and the structural error. An undeformed 3D image with the viewing angle above 100 degrees can be achieved, which can find potential applications in biomedical imaging and visualization to enhance medical analysis and diagnosis.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"115 1","pages":"1276507 - 1276507-5"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139218848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We have developed a novel point-polygon hybrid method (PPHM) for calculating computer-generated holograms (CGHs), which takes advantage of both point-based and polygon-based methods. While point-based methods are good at presenting object details, polygon-based methods are good at efficiently rendering high-density surfaces with accurate occlusion. The PPHM algorithm combines the strengths of both methods and eliminates their weaknesses to achieve higher computational efficiency. It utilizes a low-polygon approximation of the original 3D polygonal meshes and leverages the computational advantages of the wavefront recording plane and look-up table methods to generate high-resolution holograms with smooth focal cues quickly. The proposed PPHM algorithm is validated to present continuous depth cues and accurate occlusion with fewer triangles, implying high computational efficiency without quality loss.
{"title":"Advances in computer-generated hologram for rendering and acceleration based on the point-polygon hybrid method","authors":"Fan Wang, David Blinder, T. Ito, T. Shimobaba","doi":"10.1117/12.2684721","DOIUrl":"https://doi.org/10.1117/12.2684721","url":null,"abstract":"We have developed a novel point-polygon hybrid method (PPHM) for calculating computer-generated holograms (CGHs), which takes advantage of both point-based and polygon-based methods. While point-based methods are good at presenting object details, polygon-based methods are good at efficiently rendering high-density surfaces with accurate occlusion. The PPHM algorithm combines the strengths of both methods and eliminates their weaknesses to achieve higher computational efficiency. It utilizes a low-polygon approximation of the original 3D polygonal meshes and leverages the computational advantages of the wavefront recording plane and look-up table methods to generate high-resolution holograms with smooth focal cues quickly. The proposed PPHM algorithm is validated to present continuous depth cues and accurate occlusion with fewer triangles, implying high computational efficiency without quality loss.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"25 1","pages":"1276508 - 1276508-4"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139219981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ultrathin non-diffracting light sheets are crucial for light sheet fluorescence microscopy to provide near-diffraction-limited resolutions over a large field of view. Non-diffracting beams such as Bessel or Airy beams generate semi-uniform LSs that feature wide span ranges but often come with strong sidelobes or increased thickness. Moreover, they require scanning, extensive adjustments, and are costly. Through computer simulations, we show here that it is possible to generate quasi-non-diffracting static light sheets with suppressed side lobes in a simple and efficient fashion. This is achieved by placing a multiple slit interference mask (MSIM) on a cylindrical lens. As the name MSIM implies, our technique merely relies on the well-known physics of multi-slit interference to engineer light sheets. Simply dialing the mask’s geometry enables us to generate sidelobe-free light sheets with limited length or ones with a longer length but a broader thickness. This new technique promises to be adaptive in various in vivo and in vitro imaging configurations since we can engineer the light sheet, i.e., make it smaller or larger depending on the needed resolution, the size of the field of view, and the optical properties of the biological sample. This development holds significant potential for advancing microscopy techniques and facilitating groundbreaking discoveries in various biological and biomedical research fields.
{"title":"Quasi-non-diffracting static light sheets generated by multiple slit interference mask","authors":"Dennis Angelo L. Pablico, Nathaniel P. Hermosa","doi":"10.1117/12.2686657","DOIUrl":"https://doi.org/10.1117/12.2686657","url":null,"abstract":"Ultrathin non-diffracting light sheets are crucial for light sheet fluorescence microscopy to provide near-diffraction-limited resolutions over a large field of view. Non-diffracting beams such as Bessel or Airy beams generate semi-uniform LSs that feature wide span ranges but often come with strong sidelobes or increased thickness. Moreover, they require scanning, extensive adjustments, and are costly. Through computer simulations, we show here that it is possible to generate quasi-non-diffracting static light sheets with suppressed side lobes in a simple and efficient fashion. This is achieved by placing a multiple slit interference mask (MSIM) on a cylindrical lens. As the name MSIM implies, our technique merely relies on the well-known physics of multi-slit interference to engineer light sheets. Simply dialing the mask’s geometry enables us to generate sidelobe-free light sheets with limited length or ones with a longer length but a broader thickness. This new technique promises to be adaptive in various in vivo and in vitro imaging configurations since we can engineer the light sheet, i.e., make it smaller or larger depending on the needed resolution, the size of the field of view, and the optical properties of the biological sample. This development holds significant potential for advancing microscopy techniques and facilitating groundbreaking discoveries in various biological and biomedical research fields.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"9 1","pages":"127650T - 127650T-7"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139220111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In view of the problems that the existing subwavelength transmission grating structure parameters require high processing technologies and are difficult to prepare, this paper explores and investigates the design simulation of encapsulated grism grating based on the finite element method (FEM). The variation of diffraction efficiency and polarization sensitivity of encapsulated grism is explored for different groove structures, trench depth and duty cycle, according to the requirements of high diffraction efficiency and low polarization sensitivity. The grating surface etched onto a fused silica substrate is formed by binary structure of grooves and trenches filled by a high refractive index multi-layer coating, working at Littrow configuration in the SWIR-1 (1590-1625nm) and SWIR-2 (1635-1670nm). The simulation results show that the average diffraction efficiency exceeds 85% and the polarization sensitivity is less than 5% with a wide tolerance range when the depth-period ratio is about 2 and the duty cycle is around 0.6. The diffraction efficiency and polarization sensitivity meet the design requirements, substantially improving the efficiency of transmission grating design and processing. This enables compact optical design to achieve high signal-to-noise ratio and low stray light to meet the critical radiation measurement accuracy requirements.
{"title":"Design of encapsulated transmission grism with high diffraction efficiency and low polarization","authors":"Yuedan Wu, Huiying Chen, Muran He, Weimin Shen","doi":"10.1117/12.2689070","DOIUrl":"https://doi.org/10.1117/12.2689070","url":null,"abstract":"In view of the problems that the existing subwavelength transmission grating structure parameters require high processing technologies and are difficult to prepare, this paper explores and investigates the design simulation of encapsulated grism grating based on the finite element method (FEM). The variation of diffraction efficiency and polarization sensitivity of encapsulated grism is explored for different groove structures, trench depth and duty cycle, according to the requirements of high diffraction efficiency and low polarization sensitivity. The grating surface etched onto a fused silica substrate is formed by binary structure of grooves and trenches filled by a high refractive index multi-layer coating, working at Littrow configuration in the SWIR-1 (1590-1625nm) and SWIR-2 (1635-1670nm). The simulation results show that the average diffraction efficiency exceeds 85% and the polarization sensitivity is less than 5% with a wide tolerance range when the depth-period ratio is about 2 and the duty cycle is around 0.6. The diffraction efficiency and polarization sensitivity meet the design requirements, substantially improving the efficiency of transmission grating design and processing. This enables compact optical design to achieve high signal-to-noise ratio and low stray light to meet the critical radiation measurement accuracy requirements.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"50 1","pages":"127650W - 127650W-6"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139221342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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