Large aperture asymmetric Fabry Perot modulator based on asymmetric tandem quantum well for low voltage operation

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Large aperture image modulators used as demodulator in receiver path are an important component for the use in three dimensional (3D) image sensing. For practical applications, low voltage operation and high modulation performance are the key requirements for modulators. Here, we propose an asymmetric Fabry-Perot modulator (AFPM) with asymmetric tandem quantum wells (ATQWs) for 3D image sensing. By using ATQWs for the AFPM design, the device operated at -4.25V, and the operating voltage was significantly lower by about 23% compared to -5.5V of a conventional AFPM with 8nm thick multiple QW with a single QW thickness (SQWs), while achieving high reflectivity modulation in excess of 50%. The performance of the fabricated devices is in good agreement with theoretical calculations. The pixelated device shows a high modulation speed of 21.8 MHz over a large aperture and good uniformity. These results show that AFPM with ATQWs is a good candidate as an optical image modulator for 3D image sensing applications. (c) 2012 Optical Society of Americ
Publisher
OPTICAL SOC AMER
Issue Date
2012-03
Language
English
Article Type
Article
Keywords

ELECTROABSORPTION MODULATORS; HIGH-SPEED; LIGHT; DESIGN; ARRAYS; RANGE

Citation

OPTICS EXPRESS, v.20, no.6, pp.6003 - 6009

ISSN
1094-4087
DOI
10.1364/OE.20.006003
URI
http://hdl.handle.net/10203/212705
Appears in Collection
ME-Journal Papers(저널논문)
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