GaAs-based multiple-quantum-well spatial light modulators fabricated by a wafer-scale process

Area of Science:

• Optoelectronics
• Semiconductor device physics
• Integrated photonics

Background:

• Existing optical modulator technologies like liquid crystals and micromirrors are limited to kilohertz frame rates.
• There is a need for faster, high-contrast optical modulators compatible with integrated circuits.

Purpose of the Study:

• To design, fabricate, and characterize large, two-dimensional multiple-quantum-well modulator arrays.
• To achieve high-contrast, low-voltage swing optical structures suitable for complementary metal-oxide semiconductor (CMOS) integration.
• To evaluate the performance and production maturity of these novel modulator arrays.

Main Methods:

• Design of multiple-quantum-well structures for optical modulation.
• Fabrication of large, two-dimensional arrays.
• Characterization of optical contrast, uniformity, and frame rates.
• Assessment of CMOS compatibility and production scalability.

Main Results:

• Demonstrated contrast ratio of 5:1, limited by fill factor.
• Achieved uniformity variations below 1nm.
• Exceeded frame rates of 10kHz, showcasing a significant speed advantage.
• Identified design compromises for high-contrast, low-voltage operation.

Conclusions:

• The developed multiple-quantum-well modulator arrays offer superior speed performance compared to current technologies.
• The arrays are compatible with CMOS integration and show potential for high-volume production.
• These modulators represent a promising advancement in optical modulation technology for various applications.