Direct observation of Anderson localization in plasmonic terahertz devices

Shashank Pandey; Barun Gupta; Sushil Mujumdar; Ajay Nahata

doi:10.1038/lsa.2016.232

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Direct observation of Anderson localization in plasmonic terahertz devices

Original Articles

- Direct observation of Anderson localization in plasmonic terahertz devices
- Light: Science & Applications Vol. 6, Issue 2, (2017)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84112, USA
  2.Tata Institute for Fundamental Research, Mumbai 400005, India
- Author bio：
  
  A Nahata, Email: nahata@ece.utah.edu
- Funds：
- DOI：10.1038/lsa.2016.232
  CLC：
- Published：2017-06，
  
  Published Online：27 September 2016，
  
  Received：14 March 2016，
  
  Revised：14 September 2016，
  
  Accepted：26 September 2016
- Accepted：
Scan QR Code
Pandey, S. et al. Direct observation of Anderson localization in plasmonic terahertz devices. Light: Science & Applications, 6, e16232 (2017).
DOI：

Pandey, S. et al. Direct observation of Anderson localization in plasmonic terahertz devices. Light: Science & Applications, 6, e16232 (2017). DOI： 10.1038/lsa.2016.232.

摘要

Abstract

We present the first experimental observation of Anderson localization in the terahertz frequency range using plasmonic structures. To accomplish this goal

we designed THz waveguides consisting of a one-dimensional array of rectangular apertures that were fabricated in a freestanding metal foil. Disorder is introduced into the waveguide by offsetting the position of each aperture by a random distance within a prescribed range. For example

for a waveguide with apertures spaced by 250 μm in a periodic waveguide

10% disorder would correspond to the apertures being shifted by a random value between ±25 μm along the waveguide axis. We find that for disorder levels below 25%

there is only an increase in the propagation loss along the device. However

for two specific waveguides with 25% disorder

we observe a spatially localized mode that lies just within the stop band of the device and exhibits a double-sided exponential spatial decay away from the maximum.

关键词

Keywords

Anderson localizationdisordered medium1D aperiodic latticeterahertz plasmonicsterahertz waveguidestime domain spectroscopy

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