Bing Xiong, Enfei Chao, Yi Luo, Changzheng Sun, Yanjun Han, Jian Wang, Zhibiao Hao, Lai Wang, Hongtao Li. Research on ultra-wideband and high saturation power uni-traveling carrier photodetectors (Invited)[J]. Infrared and Laser Engineering, 2021, 50(7): 20211052
- Infrared and Laser Engineering
- Vol. 50, Issue 7, 20211052 (2021)
Fig. 1. Epitaxy structure of our DDL-UTC-PD (a) and (b) energy band diagram of PD under reverse bias
Fig. 2. Electric field distribution within the device under various reverse biases. (a) Typical UTC-PD; (b) DDL-UTC-PD
Fig. 3. (a) Frequency response at photocurrent of 10 mA; (b) 3 dB bandwidth at different reverse biases
Fig. 4. Voltage-dependent saturation characteristics at 105 GHz
Fig. 5. Epitaxial structure of MUTC-PD for optimization
Fig. 6. Transit-time-limited bandwidth varies with thickness of depleted absorber
Fig. 7. Circuit model for frequncy response simulation
Fig. 8. Tuning effects of high impedance transmission line on frequency response
Fig. 9. Optical microscopic photo of fabricated PD
Fig. 10. Measurement results of frequency response of 4.5 μm-diameter PD
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