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Strain-enhanced polarization sensitivity inβ-Ga_(2)O_(3)photodetector

查看全文 作　　者：Yonghui [1,2]Zhang;Huili [2,3]Liang;Fei [1]Xing;Qiqian [1]Gao;Yu [1]Feng;Yuping [1]Sun;Zengxia [2,3]Mei 高影响力作者 机构地区：[1]School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 255000,China;[2]Songshan Lake Materials Laboratory,Dongguan 523808,China;[3]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China高影响力机构 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2024年第67卷第4期,共12页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61505109,12174275,62174113,and 11974108);Youth Innovative Talents Attracting and Cultivating Plan of Colleges and Universities in Shandong Province(No.21);Youth Innovation Team of Colleges and Universities in Shandong Province(Grant No.2022KJ223);Guangdong Basic and Applied Basic Research Foundation(Grant No.2022A1515110607);Shandong Provincial Natural Science Foundation(Grant Nos.ZR2021QF020,ZR2022QF055,and ZR2021QE080)。 摘　　要：Polarization-sensitive photodetection and imaging have great application value in fields such as polarization division multiplexing optical communication,remote sensing,near-field imaging and military monitoring.Pursuing a high polarization ratio has always been the research hotspot in polarization-sensitive photodetectors.In this paper,we report a compression strain enhanced polarization ratio inβ-gallium oxide(β-Ga_(2)O_(3))single crystal flake.A rigorous crystallographic analysis confirmed its high crystalline quality and orientation.Angle-resolved polarization Raman spectroscopy(ARPRS)was adopted to study the anisotropy of its optical properties.Extensive ARPRS measurements and theoretical calculation consistently demonstrate the strong optical anisotropy in the high-qualityβ-Ga_(2)O_(3)flake.A polarization ratio of 0.96 was obtained in the flatβ-Ga_(2)O_(3)flake.Furthermore,mechanical strain of±0.7%was introduced intoβ-Ga_(2)O_(3).An increased polarization ratio of 0.98 was achieved in the case of 0.7%compression strain,which is,to the best of our knowledge,the highest value for UVC polarization-sensitive photodetectors.That corresponds to an improved polarization rejection ratio of 100.This work proposed a new path towards improving polarization sensitivity by applying strain engineering in the active material. 关 键 词：gallium oxide polarization photodetector ANISOTROPY STRAIN
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