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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Space-qualifying silicon photonic modulators and circuits.

Dun Mao^1,2, Lorry Chang¹, Hwaseob Lee¹

¹Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA.

Science Advances

|January 5, 2024

Summary

This summary is machine-generated.

Space experiments show cosmic radiation impacts photonic integrated circuits (PICs) by reducing carrier lifetime, not mobility. This maintains performance, enabling lightweight, high-capacity space communication terminals.

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Last Updated: Jul 3, 2026

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Area of Science:

Photonics
Microelectronics
Aerospace Engineering

Background:

The miniaturization of electronic components is crucial for space applications, balancing size, radiation hardness, and performance.
The size-performance trade-off for photonic integrated circuits (PICs) in space environments remains largely unexplored, potentially limiting future spaceborne instruments.
Energetic charged particles in space pose a significant threat to the long-term reliability and performance of electronic and photonic systems.

Purpose of the Study:

To investigate the effects of long-term cosmic radiation exposure on photonic integrated circuits (PICs).
To determine the impact of space radiation on key performance metrics of PICs, such as carrier mobility, carrier lifetime, and electro-optic modulation efficiency.
To assess the feasibility of using PICs in lightweight, high-capacity space communication systems.

Main Methods:

Conducting year-long space experiments exposing PICs to cosmic radiation.
Analyzing changes in carrier mobility and free carrier lifetime after radiation exposure.
Evaluating electro-optic modulation efficiency and optoelectronic bandwidth of the PICs.

Main Results:

Cosmic radiation exposure did not alter carrier mobility in the tested PICs.
A reduction in free carrier lifetime was observed due to radiation.
Electro-optic modulation efficiency remained unchanged, while optoelectronic bandwidth expanded.
Tested PIC modulators demonstrated resilience, suggesting minimal shielding requirements for certain configurations.

Conclusions:

PICs exhibit a degree of radiation tolerance in space, with minimal impact on essential performance parameters.
The observed changes in carrier lifetime do not degrade modulation efficiency, indicating suitability for space applications.
Small-footprint PIC modulators and complex waveguide routing are viable for developing lightweight, high-throughput space terminals for terabits communications and intersatellite ranging.