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

Journal Article · · Nature Communications
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [2];  [2]
  1. Univ. of California, Los Angeles, CA (United States); OSTI
  2. Univ. of California, Los Angeles, CA (United States)
  3. Shanghai Institute of Microsystem and Information Technology (China); Agency for Science, Technology and Research (A*STAR) (Singapore)
  4. Agency for Science, Technology and Research (A*STAR) (Singapore)
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.
Research Organization:
Univ. of California, Los Angeles, CA (United States); University of California, Los Angeles, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0016925
OSTI ID:
1904412
Alternate ID(s):
OSTI ID: 2001454
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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