NDLI: Capacitive Readout Technique for Studies of Dissipation in GaN Nanowire Mechanical Resonators

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Joshua, R. Montague Kris, A. Bertness Norman, A. Sanford Victor, M. Bright Charles, T. Rogers
Copyright Year	2011
Abstract	A variable-temperature homodyne reflectometry measurement technique for detecting nanoscale mechanical motion has recently been developed. We have extended this technique to make the first all-electrical measurements of an ensemble of as-grown, c-axis, single-crystal gallium nitride (GaN) nanowires. These nanowires are approximately 15 μm in length and 100 nm in diameter, and have fundamental resonance frequencies near 1 MHz, and mechanical quality factors, Q, (resonance frequency divided by resonance width) in excess of 104. These high-Q values are sensitive to surface conditions and offer the opportunity to study intrinsic damping mechanisms in the nanoscale resonators. The new microwave measurement technique has allowed us to study the ensemble behavior of nanowire resonances while varying extrinsic variables (e.g., temperature) and obtain statistics on nanowire resonance behavior. Our apparatus allows measurements to be made in either a two-phase lock-in mode, or in a power-spectrum mode, both of which have unique advantages. Our measurements demonstrate a position-spectral noise floor of 0.3 nm/ Hz, largely set by the dynamic range of our microwave readout system.
Starting Page	329
Ending Page	333
Page Count	5
File Format	PDF
ISBN	9780791854976
DOI	10.1115/IMECE2011-65420
Volume Number	Volume 11: Nano and Micro Materials, Devices and Systems; Microsystems Integration
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Damping Q-factor Temperature Crystals Locks (waterways) Nanoscale phenomena Statistics as topic Gallium nitride Microwave measurement Noise (sound) Energy dissipation Resonance Nanowires Microwaves
Content Type	Text
Resource Type	Article

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