The article proposes a measurement method using the sparse distribution detector array, and it can accurately measure the key terminal ballistic parameters (including hitting coordinates, flight velocity, firing angle and firing rate, etc.) of the supersonic projectile. Firstly, we describe the shock wave of the supersonic projectile and its propagation characteristics. What is more, the detection principle of the system is presented. Secondly, its measurement model is established through combining with the relevant structural parameters and the shock wave propagation velocity in the detection area. Next, the system is developed, and it mainly consists of several pairs of laser emitters and their receivers, two support frames, and a signal conditioning circuit. Finally, the systematic errors of the above parameters are analyzed through numerical simulation, respectively. The results show that the measurement method can meet the requirements for testing the terminal ballistic parameters of the supersonic projectile. Compared with the previous methods, it has the advantages such as better uniformity detection sensitivity, high accuracy, lower cost, easy installation and adjustment.
{"title":"Measurement method for the key terminal ballistic parameters of the supersonic projectile using the sparse distribution detector array","authors":"Ziyu Yang, Chenghua Deng, Ding Chen","doi":"10.1117/12.3006337","DOIUrl":"https://doi.org/10.1117/12.3006337","url":null,"abstract":"The article proposes a measurement method using the sparse distribution detector array, and it can accurately measure the key terminal ballistic parameters (including hitting coordinates, flight velocity, firing angle and firing rate, etc.) of the supersonic projectile. Firstly, we describe the shock wave of the supersonic projectile and its propagation characteristics. What is more, the detection principle of the system is presented. Secondly, its measurement model is established through combining with the relevant structural parameters and the shock wave propagation velocity in the detection area. Next, the system is developed, and it mainly consists of several pairs of laser emitters and their receivers, two support frames, and a signal conditioning circuit. Finally, the systematic errors of the above parameters are analyzed through numerical simulation, respectively. The results show that the measurement method can meet the requirements for testing the terminal ballistic parameters of the supersonic projectile. Compared with the previous methods, it has the advantages such as better uniformity detection sensitivity, high accuracy, lower cost, easy installation and adjustment.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"20 5","pages":"129590N - 129590N-11"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174276","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}
Shi-Chao Zhu, Xi Guo, Gui-Dong Deng, Xun Lei, Quan Cao
The growing demand for global communication services necessitates high bandwidth interconnects. With a gradual maturity in the spectral efficiency (SE) growth, extending optical bandwidth beyond the C + L-band is crucial for future optical network upgrades. Silicon photonics (SiPh) technology has already been practically implemented in short-reach optical interconnects and coherent communication links, due to the advantages in size, cost, and power consumption. Despite its commercial success, achieving a high extinction ratio (ER) with wide optical bandwidth in the volume production poses difficulties. In this paper, a power compensation method is proposed and investigated theoretically and experimentally. Compared to the convention method, our algorithm is still robust in a large range of extinction ratio from 10 dB to 45 dB, when the other child Mach–Zehnder modulator (MZM) is non-ideal and other noise exists. The new ER compensation method will be very useful in wide optical bandwidth transceivers.
全球通信服务需求的不断增长要求高带宽互联。随着频谱效率（SE）的逐步成熟，将光带宽扩展到 C + L 波段以外对于未来的光网络升级至关重要。硅光子（SiPh）技术由于在尺寸、成本和功耗方面的优势，已经在短距离光互连和相干通信链路中得到了实际应用。尽管在商业上取得了成功，但在批量生产中实现高消光比（ER）和宽光带宽仍有困难。本文提出了一种功率补偿方法，并对其进行了理论和实验研究。与传统方法相比，当另一个子马赫-泽恩德调制器（MZM）非理想和存在其他噪声时，我们的算法在 10 dB 至 45 dB 的较大消光比范围内仍然是稳健的。新的ER补偿方法将在宽光带宽收发器中大有用武之地。
{"title":"High extinction ratio of silicon photonics Mach–Zehnder IQ-modulators with wide optical bandwidth through power compensation","authors":"Shi-Chao Zhu, Xi Guo, Gui-Dong Deng, Xun Lei, Quan Cao","doi":"10.1117/12.3000931","DOIUrl":"https://doi.org/10.1117/12.3000931","url":null,"abstract":"The growing demand for global communication services necessitates high bandwidth interconnects. With a gradual maturity in the spectral efficiency (SE) growth, extending optical bandwidth beyond the C + L-band is crucial for future optical network upgrades. Silicon photonics (SiPh) technology has already been practically implemented in short-reach optical interconnects and coherent communication links, due to the advantages in size, cost, and power consumption. Despite its commercial success, achieving a high extinction ratio (ER) with wide optical bandwidth in the volume production poses difficulties. In this paper, a power compensation method is proposed and investigated theoretically and experimentally. Compared to the convention method, our algorithm is still robust in a large range of extinction ratio from 10 dB to 45 dB, when the other child Mach–Zehnder modulator (MZM) is non-ideal and other noise exists. The new ER compensation method will be very useful in wide optical bandwidth transceivers.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"7 4","pages":"1296604 - 1296604-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174516","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}
This paper introduces the simulation of the thermal focal length brought by the Conduction Cooling End-Pumped Slat(CCEPS) laser amplification module under the action of thermal stress. Through simulation analysis, it is found that the thermal focal length of CCEPS lath crystal is affected by two factors, temperature distribution and stress distribution. One of these two factors brings a positive lens effect, the other may bring a negative lens effect, and it may also bring a positive lens effect at the same time. In order to find out the law of thermal lens effect in CCEPS module, a comprehensive simulation analysis of CCEPS module is carried out. This paper provides a strong theoretical support for further experimental verification.
{"title":"Simulation of thermal focal length of conduction cooling end-pumped slat laser amplifier","authors":"Wentao Wang, S. Bian, Lei Liu, Chao Wang, Lu Chen","doi":"10.1117/12.3009375","DOIUrl":"https://doi.org/10.1117/12.3009375","url":null,"abstract":"This paper introduces the simulation of the thermal focal length brought by the Conduction Cooling End-Pumped Slat(CCEPS) laser amplification module under the action of thermal stress. Through simulation analysis, it is found that the thermal focal length of CCEPS lath crystal is affected by two factors, temperature distribution and stress distribution. One of these two factors brings a positive lens effect, the other may bring a negative lens effect, and it may also bring a positive lens effect at the same time. In order to find out the law of thermal lens effect in CCEPS module, a comprehensive simulation analysis of CCEPS module is carried out. This paper provides a strong theoretical support for further experimental verification.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"87 ","pages":"129591E - 129591E-3"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174716","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}
To ensure the proper operation of the Nuclear Magnetic Resonance Gyroscope (NMRG), a dedicated amplitude control circuit has been designed for the gas chamber. This circuit aims to fulfill the high-temperature heating requirements of the gas chamber, including achieving saturated vapor pressure, higher density, and ensuring the precise temperature stability of the gas chamber. The stability is of utmost importance as it directly impacts the accuracy of the NMRG. The circuit employs a voltage-output DAC1220, connected in series with a resistor, to drive the FS ADJUST pin of the AD9834. This configuration allows precise adjustment of the amplitude of the full-scale DAC current. The resulting signal is then amplified using a current-to-voltage conversion resistor and an Enhanced Howland Current Source (EHCS) circuit, effectively meeting the requirements for heating the gas chamber. The simulation and experiment show that the successful achievement of an AC sinusoidal heating signal with a frequency of 100KHz and a precise amplitude adjustment rangeof0-150mA.The adjustable step size of 0.01v ensures fine-tuned control. These findings validate that the heating signal fulfills the requirements for high-frequency electrical heating of the gas chamber in the NMRG.
{"title":"Design on amplitude control circuit for DDS signal source based on AD9834","authors":"Bo Li, Zhengguang Wang, Helun Song, Xiping Xu","doi":"10.1117/12.3004528","DOIUrl":"https://doi.org/10.1117/12.3004528","url":null,"abstract":"To ensure the proper operation of the Nuclear Magnetic Resonance Gyroscope (NMRG), a dedicated amplitude control circuit has been designed for the gas chamber. This circuit aims to fulfill the high-temperature heating requirements of the gas chamber, including achieving saturated vapor pressure, higher density, and ensuring the precise temperature stability of the gas chamber. The stability is of utmost importance as it directly impacts the accuracy of the NMRG. The circuit employs a voltage-output DAC1220, connected in series with a resistor, to drive the FS ADJUST pin of the AD9834. This configuration allows precise adjustment of the amplitude of the full-scale DAC current. The resulting signal is then amplified using a current-to-voltage conversion resistor and an Enhanced Howland Current Source (EHCS) circuit, effectively meeting the requirements for heating the gas chamber. The simulation and experiment show that the successful achievement of an AC sinusoidal heating signal with a frequency of 100KHz and a precise amplitude adjustment rangeof0-150mA.The adjustable step size of 0.01v ensures fine-tuned control. These findings validate that the heating signal fulfills the requirements for high-frequency electrical heating of the gas chamber in the NMRG.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"39 8","pages":"129590F - 129590F-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174794","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}
It needs a triggered time to open or close optical gate of the ICCD. The duration time is defined as irising effect time. Although it only lasts a few nanoseconds and often be ignored by users, it can still interfere with the results in some applications such as fluorescence lifetime imaging and gated imaging. This paper proposes a fitting algorithm to correct the irising effect of the image intensifier. This method obtains fitting matrices of different gates through a series delay images of ICCD. Then through these fitting matrices, the imaging pictures are effectively corrected. The advantages of this method are low cost, high efficiency, and simplicity. The verification experiment of this paper is to write letters with a highlighter. The correction algorithm can clearly restore time-resolve image, and significantly improve the contrast of the image.
{"title":"Time-resolved imaging correction of irising effect of gated image intensifiers","authors":"Xinyu Zhong, Xinwei Wang, Liang Sun, Yan Zhou","doi":"10.1117/12.3007212","DOIUrl":"https://doi.org/10.1117/12.3007212","url":null,"abstract":"It needs a triggered time to open or close optical gate of the ICCD. The duration time is defined as irising effect time. Although it only lasts a few nanoseconds and often be ignored by users, it can still interfere with the results in some applications such as fluorescence lifetime imaging and gated imaging. This paper proposes a fitting algorithm to correct the irising effect of the image intensifier. This method obtains fitting matrices of different gates through a series delay images of ICCD. Then through these fitting matrices, the imaging pictures are effectively corrected. The advantages of this method are low cost, high efficiency, and simplicity. The verification experiment of this paper is to write letters with a highlighter. The correction algorithm can clearly restore time-resolve image, and significantly improve the contrast of the image.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"22 10","pages":"129630Q - 129630Q-7"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175133","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}
Polarization lidar plays an important role in detecting the microphysical properties of non spherical aerosol particles in the atmosphere and the indirect interaction between aerosols and clouds. However, there are various complex optoelectronic components in polarization lidar systems, and the imperfect nature of these components often poses difficulties for the system to accurately receive data. To ensure the accuracy of the detection data of a multi wavelength polarization lidar system, precise calibration of the system is a crucial step. This article is based on a three wavelength (355nm, 532nm, 1064nm) polarization lidar system. Based on the ± 45 ° polarization lidar system calibration method proposed by Freudenthaler et al, an improved calibration method is designed to calibrate different wavelength detection channels. The new calibration method corrects some issues with the ± 45 ° method and proposes a calculation method to reduce the impact of cascading multiple dichroic mirrors on the received Signal The simulation results show that the use of the average polarization error angle successfully reduces the impact of cascading multiple dichroic mirrors on the signal. At the end of the article, we validated the error analysis of the proposed method under different detection wavelengths through simulation calculations. The results show that when detecting extremely small atmospheric particles such as atmospheric molecules, the detection error is around 6%. When detecting non spherical particles with a depolarization ratio greater than 0.1, the error of each detection channel can be reduced to less than 3%.
{"title":"An improved calibration method and detection error simulation for three-wavelength polarization lidar systems","authors":"Laibin Wang, Dong Liu","doi":"10.1117/12.3007111","DOIUrl":"https://doi.org/10.1117/12.3007111","url":null,"abstract":"Polarization lidar plays an important role in detecting the microphysical properties of non spherical aerosol particles in the atmosphere and the indirect interaction between aerosols and clouds. However, there are various complex optoelectronic components in polarization lidar systems, and the imperfect nature of these components often poses difficulties for the system to accurately receive data. To ensure the accuracy of the detection data of a multi wavelength polarization lidar system, precise calibration of the system is a crucial step. This article is based on a three wavelength (355nm, 532nm, 1064nm) polarization lidar system. Based on the ± 45 ° polarization lidar system calibration method proposed by Freudenthaler et al, an improved calibration method is designed to calibrate different wavelength detection channels. The new calibration method corrects some issues with the ± 45 ° method and proposes a calculation method to reduce the impact of cascading multiple dichroic mirrors on the received Signal The simulation results show that the use of the average polarization error angle successfully reduces the impact of cascading multiple dichroic mirrors on the signal. At the end of the article, we validated the error analysis of the proposed method under different detection wavelengths through simulation calculations. The results show that when detecting extremely small atmospheric particles such as atmospheric molecules, the detection error is around 6%. When detecting non spherical particles with a depolarization ratio greater than 0.1, the error of each detection channel can be reduced to less than 3%.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"15 5","pages":"129620M - 129620M-12"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175257","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 the field of face anti-counterfeiting, there are differences between the reflection spectrum of real faces and simulated faces, which can help us overcome the shortcomings of traditional RGB cameras that are difficult to identify the authenticity of faces. In our work, we designed a face anti-spoofing imaging system based on the snapshot spectral imaging chip, which can be used in face anti-spoofing imaging through the analysis of spectral imaging data. Experiments show that our sensor could reconstruct the spectrum of the face region, establish the spectral databases, and achieve face authenticity recognition under active light source based on deep convolutional neural network, with a face recognition accuracy of 95%.
{"title":"A novel cost-effective vivo facial detection technique based on snapshot spectral imaging sensor","authors":"Zhihai Wang, Shuai Wang, Bo Gao, Tianxin Wang, Lvrong Zhao, Weixing Yu","doi":"10.1117/12.3007681","DOIUrl":"https://doi.org/10.1117/12.3007681","url":null,"abstract":"In the field of face anti-counterfeiting, there are differences between the reflection spectrum of real faces and simulated faces, which can help us overcome the shortcomings of traditional RGB cameras that are difficult to identify the authenticity of faces. In our work, we designed a face anti-spoofing imaging system based on the snapshot spectral imaging chip, which can be used in face anti-spoofing imaging through the analysis of spectral imaging data. Experiments show that our sensor could reconstruct the spectrum of the face region, establish the spectral databases, and achieve face authenticity recognition under active light source based on deep convolutional neural network, with a face recognition accuracy of 95%.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"35 2","pages":"1296315 - 1296315-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175377","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}
As an optical biopsy method, PZT fiber-optic scanning two-photon endomicroscopy holds significant importance for the early detection of gastrointestinal tumors. The scanning attributes inherent to the PZT fiber scanner wield direct influence over the electro-mechanical features of the two-photon endomicroscopy, rendering it a pivotal component of distal-scanning endoscopes. This study delves into a comprehensive analysis, both in the modal and frequency domains, of a forward-fixed PZT scanner from a theoretical standpoint. Additionally, we fabricated a forward-fixed PZT fiber scanner and validated its first- and second-order frequency domain characteristics experimentally. Theoretical simulations and experimental findings demonstrate that the forward-fixed scanner exhibits superior driving capability compared to the reverse-fixed scanner.
{"title":"Comparison between forward-fixed and reverse-fixed PZT fiber scanner for nonlinear endomicroscopy","authors":"Conghao Wang, Huilan Liu, Aimin Wang, Lishuang Feng","doi":"10.1117/12.3008928","DOIUrl":"https://doi.org/10.1117/12.3008928","url":null,"abstract":"As an optical biopsy method, PZT fiber-optic scanning two-photon endomicroscopy holds significant importance for the early detection of gastrointestinal tumors. The scanning attributes inherent to the PZT fiber scanner wield direct influence over the electro-mechanical features of the two-photon endomicroscopy, rendering it a pivotal component of distal-scanning endoscopes. This study delves into a comprehensive analysis, both in the modal and frequency domains, of a forward-fixed PZT scanner from a theoretical standpoint. Additionally, we fabricated a forward-fixed PZT fiber scanner and validated its first- and second-order frequency domain characteristics experimentally. Theoretical simulations and experimental findings demonstrate that the forward-fixed scanner exhibits superior driving capability compared to the reverse-fixed scanner.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"15 1","pages":"1296320 - 1296320-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175685","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}
Beam-steering devices play a vital role in the realm of optical wireless communication (OWC). However, conventional beam-steering technologies based on spatial light modulators, digital micro-mirror devices, gratings, and waveguides have limited performance with tradeoffs between multi-functionalities, high modulation speed, and compactness, which significantly curtail the potential applications of OWC. Herein, a translation-controlled beam-steering metasurface consisting of two metalens arrays is designed, which can achieve high modulation speed, versatile functionalities, and ultra-compactness. In our simulation, multiple functionalities, such as single-angular-mode switching and switching between single-angular-mode and dual-angular-mode have been realized by shifting one of the metalens arrays. Moreover, the dimension of the meta-device is only 200 μm × 200 μm. Our preliminary experimental results show that the switching speed can reach up to 6 KHz. The proposed metasurface circumvents the previous issues, providing a new design paradigm for high-performance OWC.
{"title":"Translation-controlled beam-steering metasurfaces for optical wireless communications","authors":"Dongyu Hu","doi":"10.1117/12.3007601","DOIUrl":"https://doi.org/10.1117/12.3007601","url":null,"abstract":"Beam-steering devices play a vital role in the realm of optical wireless communication (OWC). However, conventional beam-steering technologies based on spatial light modulators, digital micro-mirror devices, gratings, and waveguides have limited performance with tradeoffs between multi-functionalities, high modulation speed, and compactness, which significantly curtail the potential applications of OWC. Herein, a translation-controlled beam-steering metasurface consisting of two metalens arrays is designed, which can achieve high modulation speed, versatile functionalities, and ultra-compactness. In our simulation, multiple functionalities, such as single-angular-mode switching and switching between single-angular-mode and dual-angular-mode have been realized by shifting one of the metalens arrays. Moreover, the dimension of the meta-device is only 200 μm × 200 μm. Our preliminary experimental results show that the switching speed can reach up to 6 KHz. The proposed metasurface circumvents the previous issues, providing a new design paradigm for high-performance OWC.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"54 ","pages":"129610B - 129610B-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175902","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 this study, we introduce a novel approach for achieving narrowband filters in hyperspectral imaging spectrometers. By embedding photonic crystals within distributed Bragg reflectors (DBRs), we create resonant structures. Through meticulous simulations, we optimize a four-layer DBR configuration, resulting in spectral channels with a 3 nm average FWHM and exceeding 99% peak transmittance. Our key innovation lies in using photonic crystals to modulate transmission. By introducing TiO2 periodic structures, we control the effective refractive index and there by tune transmission wavelengths. The method covers a 475-625 nm spectral range with exceptional transmittance. We also investigate incident light angle effects, revealing systematic shifts in transmission peak. Our design offers adaptability by adjusting DBR film thickness for defining operational ranges and selecting TiO2 cylinder radii for precise channel manipulation. Our approach simplifies fabrication and holds potential for cost-effective hyperspectral imaging filters.
{"title":"Design of photonic-crystal-modulated narrowband multichannel filters for visible light with high transmittance","authors":"Tianxin Wang, Shuai Wang, Bo Gao, Weixing Yu","doi":"10.1117/12.3007882","DOIUrl":"https://doi.org/10.1117/12.3007882","url":null,"abstract":"In this study, we introduce a novel approach for achieving narrowband filters in hyperspectral imaging spectrometers. By embedding photonic crystals within distributed Bragg reflectors (DBRs), we create resonant structures. Through meticulous simulations, we optimize a four-layer DBR configuration, resulting in spectral channels with a 3 nm average FWHM and exceeding 99% peak transmittance. Our key innovation lies in using photonic crystals to modulate transmission. By introducing TiO2 periodic structures, we control the effective refractive index and there by tune transmission wavelengths. The method covers a 475-625 nm spectral range with exceptional transmittance. We also investigate incident light angle effects, revealing systematic shifts in transmission peak. Our design offers adaptability by adjusting DBR film thickness for defining operational ranges and selecting TiO2 cylinder radii for precise channel manipulation. Our approach simplifies fabrication and holds potential for cost-effective hyperspectral imaging filters.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"162 ","pages":"129620C - 129620C-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176055","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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