Title: Refractive Index Sensor Based on a Gradient Grating Period Guided-Mode Resonance
Authors: Hsiung, Chan-Te
Huang, Cheng-Sheng
機械工程學系
Department of Mechanical Engineering
Keywords: Bandstop filter;guided-mode resonance;sub-wavelength nanostructure
Issue Date: 1-Feb-2019
Abstract: In this letter, we introduce a novel refractive index sensor based on gradient grating period guided-mode resonance (GGP-GMR). Rather than a constant grating period, as in typical GMR, GGP-GMR comprises a grating period varying in increments of 2 nm. For grating variation from 386 to 392 nm, a detection range of 0.109 RIU with a bulk sensitivity of 1433.7 mu m/RIU and theoretical and experimental detection limits of 5.58 x 10(-3) and 10(-2) RIU, respectively, can be achieved. Several tactics that can be readily adopted are suggested to improve the limit of detection by an order of 10(-4) RIU, sufficient for detecting many clinically relevant biomarkers. The readout system requires a narrow band of light and a simple charge-coupled device combined with the compact design of the GGP-GMR sensor, which eases the miniaturization of the system for handheld devices as well as its integration with smartphones.
URI: http://dx.doi.org/10.1109/LPT.2019.2890873
http://hdl.handle.net/11536/148797
ISSN: 1041-1135
DOI: 10.1109/LPT.2019.2890873
Journal: IEEE PHOTONICS TECHNOLOGY LETTERS
Volume: 31
Begin Page: 253
End Page: 256
Appears in Collections:Articles