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Title: Polymer lattices as mechanically tunable 3-dimensional photonic crystals operating in the infrared

Broadly tunable photonic crystals in the near- to mid-infrared region could find use in spectroscopy, non-invasive medical diagnosis, chemical and biological sensing, and military applications, but so far have not been widely realized. We report the fabrication and characterization of three-dimensional tunable photonic crystals composed of polymer nanolattices with an octahedron unit-cell geometry. These photonic crystals exhibit a strong peak in reflection in the mid-infrared that shifts substantially and reversibly with application of compressive uniaxial strain. A strain of ∼40% results in a 2.2 μm wavelength shift in the pseudo-stop band, from 7.3 μm for the as-fabricated nanolattice to 5.1 μm when strained. We found a linear relationship between the overall compressive strain in the photonic crystal and the resulting stopband shift, with a ∼50 nm blueshift in the reflection peak position per percent increase in strain. These results suggest that architected nanolattices can serve as efficient three-dimensional mechanically tunable photonic crystals, providing a foundation for new opto-mechanical components and devices across infrared and possibly visible frequencies.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3]
  1. Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, California 91125 (United States)
  2. Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States)
  3. (United States)
  4. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States)
Publication Date:
OSTI Identifier:
22482031
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 10; 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; CRYSTALS; FABRICATION; PEAKS; POLYMERS; REFLECTION; SPECTROSCOPY; STRAINS; THREE-DIMENSIONAL LATTICES; WAVELENGTHS