Snapshot hyperspectral imaging based on a diffractive optical element(DOE)is increasingly featured in recent progress in deep optics.Despite remarkable advances in spatial and spectral resolutions,the limitations of c...Snapshot hyperspectral imaging based on a diffractive optical element(DOE)is increasingly featured in recent progress in deep optics.Despite remarkable advances in spatial and spectral resolutions,the limitations of current photolithography technology have prevented the fabricated DOE from being designed at ideal heights and with high diffraction efficiency,diminishing the effectiveness of coded imaging and reconstruction accuracy in some bands.Here,we propose,to our knowledge,a new lensless efficient snapshot hyperspectral imaging(LESHI)system that utilizes a liquid-crystal-on-silicon spatial light modulator(LCoS-SLM)to replace the traditionally fabricated DOE,resulting in high modulation levels and reconstruction accuracy.Beyond the single-lens imaging model,the system can leverage the switch ability of LCoS-SLM to implement distributed diffractive optics(DDO)imaging and enhance diffraction efficiency across the full visible spectrum.Using the proposed method,we develop a proof-of-concept prototype with an image resolution of 1920×1080 pixels,an effective spatial resolution of 41.74μm,and a spectral resolution of 10 nm,while improving the average diffraction efficiency from 0.75 to0.91 over the visible wavelength range(400-700 nm).Additionally,LESHI allows the focal length to be adjusted from 50 mm to 100 mm without the need for additional optical components,providing a cost-effective and timesaving solution for real-time on-site debugging.LESHI is the first imaging modality,to the best of our knowledge,to use dynamic diffractive optics and snapshot hyperspectral imaging,offering a completely new approach to computational spectral imaging and deep optics.展开更多
Birefringent crystals,capable of modulating the polarization state of light,play a critical role in laser technologies such as communication and quantum optics.Despite remarkable progress in commercial birefringent cr...Birefringent crystals,capable of modulating the polarization state of light,play a critical role in laser technologies such as communication and quantum optics.Despite remarkable progress in commercial birefringent crystals across the ultraviolet to near-infrared spectrum,the design of novel mid-and far-IR(MFIR)birefringent crystals faces fundamental challenges from inherent infrared absorption and poor optical anisotropy in these wavelength ranges.To address this,the first compound Ba_(2)La_(2)Sb_(4)S_(10)(S_(2))in the Ba-La-Sb-S system was successfully synthesized,driven by the stereochemically active lone pair(SCALP)effect.Ba_(2)La_(2)Sb_(4)S_(10)(S_(2))has a medium band gap(1.86 eV)and exhibits large birefringence(0.53 at 1064 nm).IR and Raman spectra confirm its broad transmission range(1-14μm)with negligible absorption,demonstrating its suitability for MFIR optical devices.Furthermore,detailed analysis of the structure-property relationship,derived from first-principles calculations,reveals that the strong SCALP effect of Sb^(3+)in the structure significantly enhances the birefringence.This study not only provides a highly promising MFIR birefringent crystal but also validates the effectiveness of the SCALP-driven design strategy in the design of high-performance infrared birefringent materials.展开更多
基金National Key Research and Development Program of China(2023YFB3611500)National Natural Science Foundation of China(62131003,62332003)A*STAR RIE2020 AME Programmatic Funding(A18A7b0058)。
文摘Snapshot hyperspectral imaging based on a diffractive optical element(DOE)is increasingly featured in recent progress in deep optics.Despite remarkable advances in spatial and spectral resolutions,the limitations of current photolithography technology have prevented the fabricated DOE from being designed at ideal heights and with high diffraction efficiency,diminishing the effectiveness of coded imaging and reconstruction accuracy in some bands.Here,we propose,to our knowledge,a new lensless efficient snapshot hyperspectral imaging(LESHI)system that utilizes a liquid-crystal-on-silicon spatial light modulator(LCoS-SLM)to replace the traditionally fabricated DOE,resulting in high modulation levels and reconstruction accuracy.Beyond the single-lens imaging model,the system can leverage the switch ability of LCoS-SLM to implement distributed diffractive optics(DDO)imaging and enhance diffraction efficiency across the full visible spectrum.Using the proposed method,we develop a proof-of-concept prototype with an image resolution of 1920×1080 pixels,an effective spatial resolution of 41.74μm,and a spectral resolution of 10 nm,while improving the average diffraction efficiency from 0.75 to0.91 over the visible wavelength range(400-700 nm).Additionally,LESHI allows the focal length to be adjusted from 50 mm to 100 mm without the need for additional optical components,providing a cost-effective and timesaving solution for real-time on-site debugging.LESHI is the first imaging modality,to the best of our knowledge,to use dynamic diffractive optics and snapshot hyperspectral imaging,offering a completely new approach to computational spectral imaging and deep optics.
基金financially supported by the National Natural Science Foundation of China(grant no.52102003 and 52172002)the Natural Science Foundation of Heilongjiang Province(grant no.YQ2023E009)+2 种基金the China Postdoctoral Science Foundation(grant no.2021M690816)the Postdoctoral Fellowship of Heilongjiang Province(grant no.LBH-Z21012)the Fundamental Research Funds for the Central Universities(grant no.HIT.OCEF.2022016).
文摘Birefringent crystals,capable of modulating the polarization state of light,play a critical role in laser technologies such as communication and quantum optics.Despite remarkable progress in commercial birefringent crystals across the ultraviolet to near-infrared spectrum,the design of novel mid-and far-IR(MFIR)birefringent crystals faces fundamental challenges from inherent infrared absorption and poor optical anisotropy in these wavelength ranges.To address this,the first compound Ba_(2)La_(2)Sb_(4)S_(10)(S_(2))in the Ba-La-Sb-S system was successfully synthesized,driven by the stereochemically active lone pair(SCALP)effect.Ba_(2)La_(2)Sb_(4)S_(10)(S_(2))has a medium band gap(1.86 eV)and exhibits large birefringence(0.53 at 1064 nm).IR and Raman spectra confirm its broad transmission range(1-14μm)with negligible absorption,demonstrating its suitability for MFIR optical devices.Furthermore,detailed analysis of the structure-property relationship,derived from first-principles calculations,reveals that the strong SCALP effect of Sb^(3+)in the structure significantly enhances the birefringence.This study not only provides a highly promising MFIR birefringent crystal but also validates the effectiveness of the SCALP-driven design strategy in the design of high-performance infrared birefringent materials.
