Title :
RCEPD With Enhanced Light Absorption by Crown-Shaped Quantum Well
Author :
Gun Wu Ju ; Byung Hoon Na ; Hee Ju Choi ; Kwang Wook Park ; Young Min Song ; Yong Tak Lee
Author_Institution :
Sch. of Inf. & Commun, Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
Abstract :
A high-performance resonant cavity enhanced photodetector (RCEPD) is developed by introducing an InGaAs/GaAs crown-shaped quantum well (CSQW) structure. In calculation, the absorption coefficient of the proposed CSQW structure is significantly enhanced by 47.8% compared with that of the conventional QW without increasing the electric field due to the large overlap of electron/hole-wave functions. To verify the feasibility of our proposed QW structure, we fabricate RCEPDs with a designed CSQW and the conventional QW structure. The fabricated CSQW-RCEPD exhibits a maximum quantum efficiency of 45.4%, an improvement of 36.2% in comparison with the conventional RCEPD. Moreover, the spectral bandwidth is 4.7 nm in the CSQW-RCEPD, which is in good agreement with the calculated result. The RCEPD with enhanced light absorption using a CSQW structure is highly promising for optical interconnect and sensing applications.
Keywords :
III-V semiconductors; absorption coefficients; gallium arsenide; indium compounds; optical design techniques; optical fabrication; optical resonators; optical testing; photodetectors; quantum optics; semiconductor quantum wells; wave functions; CSQW-RCEPD fabrication; absorption coefficient; crown-shaped quantum well structure design; electric field; electron-hole-wave functions; high-performance resonant cavity enhanced photodetector fabrication; indium gallium arsenide-gallium arsenide CSQW structure; maximum quantum efficiency; optical interconnect applications; optical sensing applications; spectral bandwidth; wavelength 4.7 nm; Absorption; Bandwidth; Cavity resonators; Distributed Bragg reflectors; Photodetectors; Semiconductor device measurement; Wavelength measurement; Quantum well (QW); resonant-cavity-enhanced photodetector (RCEPD);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2450022
