High-speed ultra-broadband detection based on interfacial work function internal photoemission detector

TL;DR

This paper introduces a novel ratchet heterojunction IWIP detector capable of ultra-broadband detection from 3 to 165 THz, achieving high-speed response suitable for aerospace and security applications.

Contribution

It proposes a new HEIWIP detector design that combines multiple absorption mechanisms for simultaneous high-speed and ultra-broadband photon detection.

Findings

Achieved 5.1 GHz 3dB bandwidth via microwave rectification

Successfully detected 4.255 GHz inter-mode optical beat note

Demonstrated 3-165 THz ultra-broadband coverage

Abstract

High-speed ultra-broadband detectors play a crucial role in aerospace technology, and national security etc. The interfacial work function internal photoemission (IWIP) detector employs multiple absorption mechanism comprehensively across different wavelength band to achieve complete photon type detection, which makes it possible to realize high-speed and ultra-broadband simultaneously. We propose a ratchet heterojunction IWIP (HEIWIP) detector, which shows 3-165THz ultra-broadband coverage. The high-speed response is investigated in detail by both microwave rectification technology and high-speed modulated terahertz light. Up to 5.1GHz 3dB bandwidth is acquired in terms of microwave rectification measurement. And 4.255GHz inter-mode optical beat note signal was successfully detected.