Gongqing Li, Xiaofeng Duan, Weifang Yuan, Yongqing Huang, Kai Liu, Xiaomin Ren, "Quasi-resonant cavity enhanced photodetector with a subwavelength grating," Chin. Opt. Lett. 20, 031301 (2022)

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- Chinese Optics Letters
- Vol. 20, Issue 3, 031301 (2022)

Fig. 1. (a) Schematic structure and (b) schematic layout of the QRCE-PD.

Fig. 2. Reflectivity of the FPC as a function of wavelength at normal incidence (black solid line) and as a function of incident angle at the 1550 nm wavelength (red dash dot line).

Fig. 3. (a) Electric field intensity distribution and (b) structure parameters of the SWG reflector.

Fig. 4. (a) Equivalent inclined-ridge cavity structure of the QRCE-PD and (b) schematic diagram of forming region 1 by multiple mutual mirroring.

Fig. 5. Equivalent multi-region F-P cavity structure of the QRCE-PD, which forms a multi-region RCE-PDs structure together with a built-in photodetector.

Fig. 6. (a) Normalized electric field intensity distribution and region distribution of the QRCE-PD. (b) Simulated spectral response of QRCE-PD, conventional RCE-PD, and p-i-n photodetector.

Fig. 7. Spectral response of QRCE-PD when tuning the refractive index of the cavity layer of the FPC.

Fig. 8. Frequency response of the embedded p-i-n photodiode at -3 V bias.
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Table 1. Layer Structure of the Embedded p-i-n Photodiode
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Table 2. Theoretical Parameters of Each Absorption Region
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Table 3. Performance Parameters of Different Long Wavelength Devices

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