A Gradient Grating Period Guided-Mode Resonance Spectrometer

Hsin-Yun Hsu, Yi Hsuan Lan, Cheng-Sheng Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

This paper reports a compact spectrometer based on a guided-mode resonance (GMR) filter mounted on a linear charge-coupled device (CCD). The GMR is specially designed to exhibit gradient grating periods (GPPs) laterally to ensure that the GMR functions as a linear-variable bandstop filter. Each period corresponds to a resonant wavelength such that this wavelength is reflected back at its corresponding resonant period and transmitted to all other periods. Consequently, when a resonant wavelength is incident on the GGP-GMR attached to a linear CCD, the CCD pixel underneath its resonant period receives the minimum intensity, and the other pixels receive higher intensities. In terms of the wavelength range of interest, by scanning a single wavelength at a time, a transmission efficiency matrix that contains the transmission efficiency of each wavelength at each pixel can be established. An unknown incident spectrum can be reconstructed using the established transmission efficiency matrix and the intensity measured using the CCD. In this study, a GGP-GMR spectrometer less than 3 mm long that can achieve a wavelength detection range of 200 nm was demonstrated to reconstruct various incident spectra, including a single wavelength of light with a resolution of 0.5 nm, a single wavelength of light with varying intensity levels, and dual incident light sources.

Original languageEnglish
Article number4500109
JournalIEEE Photonics Journal
Volume10
Issue number1
DOIs
StatePublished - 1 Feb 2018

Keywords

  • Gratings
  • optical filters
  • spectroscopy
  • subwavelength structures
  • wavelength measurement

Fingerprint Dive into the research topics of 'A Gradient Grating Period Guided-Mode Resonance Spectrometer'. Together they form a unique fingerprint.

Cite this