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Title: Ultra-compact and wide-spectrum-range thermo-optic switch based on silicon coupled photonic crystal microcavities

We design, fabricate, and experimentally demonstrate a compact thermo-optic gate switch comprising a 3.78 μm-long coupled L0-type photonic crystal microcavities on a silicon-on-insulator substrate. A nanohole is inserted in the center of each individual L0 photonic crystal microcavity. Coupling between identical microcavities gives rise to bonding and anti-bonding states of the coupled photonic molecules. The coupled photonic crystal microcavities are numerically simulated and experimentally verified with a 6 nm-wide flat-bottom resonance in its transmission spectrum, which enables wider operational spectrum range than microring resonators. An integrated micro-heater is in direct contact with the silicon core to efficiently drive the device. The thermo-optic switch is measured with an optical extinction ratio of 20 dB, an on-off switching power of 18.2 mW, a thermo-optic tuning efficiency of 0.63 nm/mW, a rise time of 14.8 μs, and a fall time of 18.5 μs. The measured on-chip loss on the transmission band is as low as 1 dB.
Authors:
; ; ;  [1] ;  [2] ;  [1] ;  [3]
  1. Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas 78758 (United States)
  2. Omega Optics, Inc., Austin, Texas 78757 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22486143
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOUND STATE; COUPLING; CRYSTALS; DESIGN; EFFICIENCY; MOLECULES; RESONANCE; RESONATORS; SILICON; SIMULATION; SPECTRA; SUBSTRATES; SWITCHES; TUNING