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Title: Tunable ultrasonic phononic crystal controlled by infrared radiation

A tunable phononic crystal based ultrasonic filter was designed by stimulating the phase of the polymeric material embedded in a periodic structure using infrared radiation. The acoustic filter can be tuned remotely using thermal stimulation induced by the infrared radiation. The filter is composed of steel cylinder scatterers arranged periodically in a background of bulk poly (N-isopropylacrylamide) polymer hydrogel. The lattice structure creates forbidden bands for certain sets of mechanical waves that cause it to behave as an ultrasonic filter. Since the bandstructure is determined by not only the arrangement of the scatterers but also the physical properties of the materials composing the scatterers and background, modulating either the arrangement or physical properties will alter the effect of the crystal on propagating mechanical waves. Here, the physical properties of the filter are varied by inducing changes in the polymer hydrogel using an electromagnetic thermal stimulus. With particular focus on the k{sub 00}-wave, the transmission of ultrasonic wave changes by as much as 20 dBm, and band widths by 22% for select bands.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [1]
  1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  2. (United States)
  3. University of North Texas, Department of Physics, Denton, Texas 76201 (United States)
  4. (Mexico)
  5. Universidad Autónoma del Estado de México, Toluca 50120 (Mexico)
Publication Date:
OSTI Identifier:
22350866
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; CYLINDERS; FILTERS; INFRARED RADIATION; PHYSICAL PROPERTIES; POLYMERS; REFRACTIVE INDEX; STIMULATION; STIMULI; TRANSMISSION; ULTRASONIC WAVES