Open AccessDevelopment of a TiO2/SiO2 waveguide-mode chip for an ultraviolet near-field fluorescence sensor
Author(s) -
Chiaki Kuroda,
M. Nakai,
Makoto Fujimaki,
Yoshimichi Ohki
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.006796
Subject(s) - materials science , fluorescence , optoelectronics , optics , electric field , waveguide , ultraviolet , dielectric , surface plasmon resonance , chip , total internal reflection , surface plasmon , planar , substrate (aquarium) , quantum dot , plasmon , nanotechnology , physics , oceanography , nanoparticle , electrical engineering , engineering , computer graphics (images) , quantum mechanics , geology , computer science
Aimed at detecting fluorescent-labeled biological substances sensitively, a sensor that utilizes near-field light has attracted much attention. According to our calculations, a planar structure composed of two dielectric layers can enhance the electric field of UV near-field light effectively by inducing waveguide-mode (WM) resonance. The fluorescence intensity obtainable by a WM chip with an optimized structure is 5.5 times that obtainable by an optimized surface plasmon resonance chip. We confirmed the above by making a WM chip consisting of TiO 2 and SiO 2 layers on a silica glass substrate and by measuring the fluorescence intensity of a solution of quantum dots dropped on the chip.