Coherent terahertz radiation with 2.8-octave tunability through chip-scale photomixed microresonator optical parametric oscillation

Wenting Wang (), Ping-Keng Lu, Abhinav Kumar Vinod, Deniz Turan, James F. McMillan, Hao Liu, Mingbin Yu, Dim-Lee Kwong, Mona Jarrahi () and Chee Wei Wong ()
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Wenting Wang: University of California
Ping-Keng Lu: University of California
Abhinav Kumar Vinod: University of California
Deniz Turan: University of California
James F. McMillan: University of California
Hao Liu: University of California
Mingbin Yu: Shanghai Institute of Microsystem and Information Technology
Dim-Lee Kwong: Institute of Microelectronics, A*STAR
Mona Jarrahi: University of California
Chee Wei Wong: University of California

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract High-spectral-purity frequency-agile room-temperature sources in the terahertz spectrum are foundational elements for imaging, sensing, metrology, and communications. Here we present a chip-scale optical parametric oscillator based on an integrated nonlinear microresonator that provides broadly tunable single-frequency and multi-frequency oscillators in the terahertz regime. Through optical-to-terahertz down-conversion using a plasmonic nanoantenna array, coherent terahertz radiation spanning 2.8-octaves is achieved from 330 GHz to 2.3 THz, with ≈20 GHz cavity-mode-limited frequency tuning step and ≈10 MHz intracavity-mode continuous frequency tuning range at each step. By controlling the microresonator intracavity power and pump-resonance detuning, tunable multi-frequency terahertz oscillators are also realized. Furthermore, by stabilizing the microresonator pump power and wavelength, sub-100 Hz linewidth of the terahertz radiation with 10−15 residual frequency instability is demonstrated. The room-temperature generation of both single-frequency, frequency-agile terahertz radiation and multi-frequency terahertz oscillators in the chip-scale platform offers unique capabilities in metrology, sensing, imaging and communications.

Date: 2022
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DOI: 10.1038/s41467-022-32739-6

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