TitleProposal and numerical study of a flexible visible photonic crystal defect cavity for nanoscale strain sensors
AuthorsZhou, Jie
Zhou, Taojie
Li, Jiagen
He, Kebo
Qiu, Zhiren
Qiu, Bocang
Zhang, Zhaoyu
AffiliationPeking Univ, Sch Elect & Comp Engn, Shenzhen 518055, Peoples R China.
Chinese Univ Hong Kong, Sch Sci & Engn, Shenzhen 518072, Peoples R China.
Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China.
Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China.
Shenzhen Raybow Optoelect Corp, Shenzhen 518055, Peoples R China.
Tsinghua Univ Shenzhen, Res Inst, Shenzhen 518055, Peoples R China.
Issue Date2017
CitationOPTICS EXPRESS.2017,25(20),23645-23653.
AbstractA flexible photonic crystal cavity, consisting of a III V active layer embedded in a flexible medium, with a line-defect by removing three air holes for nanoscale structural deformation detection is proposed and optimized The cavity can hold the photonic band-gap modes with the fundamental mode located at approximately 686 nm, overlapping with the photoluminescence spectrum of the InGaP/InGaA1P quantum wells. Results of finite difference time-domain simulations indicate that the L3 cavity features an ultra-compact mode volume of 10(-3) mu m(3) and high quality factor of 10(4) at a sub-micron footprint within the studied visible wavelength. Theoretical optical strain sensitivities of approximately 4.5 and 3 nm per epsilon (1% strain for both) for the x and y directions are predicted, respectively. When the cavity is under large bending curvatures, the Q factor rapidly decreases from 8000 to 2000. (C) 2017 Optical Society of America
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