Na Byung Hoon, Ju Gun Wu, Choi Hee Ju, Cho Yong Chul, Park Yong Hwa, Lee Yong Tak
School of Information and Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea.
Opt Express. 2012 Mar 12;20(6):6003-9. doi: 10.1364/OE.20.006003.
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.
在接收器路径中用作解调器的大孔径图像调制器是用于三维（3D）图像传感的重要组件。对于实际应用，低电压操作和高调制性能是调制器的关键要求。在此，我们提出一种用于3D图像传感的具有非对称串联量子阱（ATQW）的非对称法布里 - 珀罗调制器（AFPM）。通过将ATQW用于AFPM设计，该器件在-4.25V下工作，与具有8nm厚多量子阱且单量子阱厚度（SQW）的传统AFPM的-5.5V相比，工作电压显著降低约23%，同时实现了超过50%的高反射率调制。所制备器件的性能与理论计算结果吻合良好。像素化器件在大孔径上显示出21.8 MHz的高调制速度和良好的均匀性。这些结果表明，具有ATQW的AFPM是用于3D图像传感应用的光学图像调制器的良好候选者。
