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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 18,
  • Issue 6,
  • pp. 788-792
  • (2014)

Sub-Micrometer-Sized Spectrometer by Using Plasmonic Tapered Channel-Waveguide

Open Access Open Access

Abstract

It has been a critical issue to reduce the size of spectrometers in many fields such as on-chip chemical and biological sensing. The proposed plasmonic channel-waveguide with a sub-micrometer width has a cutoff frequency which enables us to control wavelength dependent propagation properties. We focused on the capability of the waveguide for spectral-to-spatial mapping when the waveguide width changes gradually. In this paper, we propose a plasmonic tapered channel-waveguide structure as a compact spectrometer with a physical size of <TEX>$0.24{\times}2.0{\times}0.20{\mu}m^3$</TEX>. The scattering point just above the tapered waveguide moves linearly depending on the wavelength of the injecting light. The spectral-to-spatial mapping can be improved by increasing the tapered length.

© 2014 Optical Society of Korea

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