Detection of evanescent waves using disordered nanowires

Wonshik Choi, Donggyu Kim, Keumyoung Seo, Wonjun Choi, Moonseok Kim, Uk Kang, Sanghyun Ju

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Conventional optical microscopy is incapable of detecting evanescent waves scattered at a target object, which poses diffraction limit in the spatial resolution. This limitation can be overcome by placing a sub-wavelength structure near the object and converting evanescent waves into detectable propagating waves. In this study, we investigated the possibility of using disordered nanowires as special sub-wavelength structures for the detection of evanescent waves. To this end, we generated evanescent waves by using a half-sphere ball lens with high refractive index and measured the waves scattered by the nanowires deposited on the flat surface of the ball lens. We observed that a layer of randomly grown nanowires scattered the evanescent waves into the far-field region. We also found that the use of a shorter wavelength light source is advantageous in detecting the high spatial frequency component of the evanescent waves even with the shallower skin depth. Our study will pave the way for exploiting a disordered medium as a far-field superlens for the scanning-free near-field imaging.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalOptics Communications
Volume297
DOIs
Publication statusPublished - 2013 Jun 15

Fingerprint

evanescent waves
Nanowires
nanowires
far fields
balls
lenses
wavelengths
Wavelength
Lenses
flat surfaces
near fields
light sources
spatial resolution
refractivity
microscopy
Optical microscopy
Light sources
Refractive index
Skin
scanning

Keywords

  • Disordered Medium
  • Disordered Nanowires
  • Evanescent Fields
  • Far-field Superlens
  • Superresolution
  • Wide-field Imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Detection of evanescent waves using disordered nanowires. / Choi, Wonshik; Kim, Donggyu; Seo, Keumyoung; Choi, Wonjun; Kim, Moonseok; Kang, Uk; Ju, Sanghyun.

In: Optics Communications, Vol. 297, 15.06.2013, p. 1-6.

Research output: Contribution to journalArticle

Choi, Wonshik ; Kim, Donggyu ; Seo, Keumyoung ; Choi, Wonjun ; Kim, Moonseok ; Kang, Uk ; Ju, Sanghyun. / Detection of evanescent waves using disordered nanowires. In: Optics Communications. 2013 ; Vol. 297. pp. 1-6.
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