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Proceedings Paper

Laser-induced phonon-phonon interactions in an on-chip silicon optomechanical crystal (Conference Presentation)
Author(s): Rishi N. Patel; Wentao Jiang; Zhaoyou Wang; Jeff T. Hill; Christopher J. Sarabalis; Amir H. Safavi-Naeini

Paper Abstract

Multi-mode optomechanical systems have formed the basis of recent proposals and experiments, enabling optical frequency translation and hybridization of near-resonant mechanical modes. An important question is how to control the internal mechanical states of such systems using laser light. Such control enables engineering of effective nonlinearities for phonons, allowing phonon-phonon frequency translation, mechanical entanglement, and precision metrology. On-chip engineered nanostructures are particularly suitable for exploring multi-mode systems. Here, we consider a silicon nanobeam optomechanical crystal with two mechanical modes coupled to a common optical mode. Simulations of the phonon-phonon scattering parameters of the system suggest that large conversion efficiency can be obtained at cryogenic temperatures. We show that remarkably, phonon-phonon conversion efficiency near unity is achievable, even when the loss rate of the intermediate optical mode dominates all other rates in the system by several orders of magnitude. This counter-intuitive phenomenon is the result of a long-lived mechanical dark state of the system that arises in the optical pumping scheme being used. We experimentally demonstrate two GHz frequency mechanical modes, separated by nearly 300 MHz, coupled to a first-order common optical TE mode with vacuum coupling rates of nearly 500 kHz. By optically driving the optomechanical crystal with two tones separated by the mechanical difference frequency we present evidence for optically induced phonon-phonon interactions at room temperature. We will present results of measurements in a cryogenic environment, operating at 4 Kelvin demonstrating improved large phonon-phonon conversion efficiency.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10112, Photonic and Phononic Properties of Engineered Nanostructures VII, 101121Z (28 April 2017); doi: 10.1117/12.2253031
Show Author Affiliations
Rishi N. Patel, Stanford Univ. (United States)
Wentao Jiang, Tsinghua Univ. (China)
Stanford Univ. (United States)
Zhaoyou Wang, Stanford Univ. (United States)
Tsinghua Univ. (China)
Jeff T. Hill, Stanford Univ. (United States)
Christopher J. Sarabalis, Stanford Univ. (United States)
Amir H. Safavi-Naeini, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 10112:
Photonic and Phononic Properties of Engineered Nanostructures VII
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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