Sensors and Materials

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Sensors and Materials
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pp. 63-70
S&M1748 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2019.2044
Published: January 15, 2019

Waveguide-mode Illumination for Enhanced Fluorescent Microscopy [PDF]

Masato Yasuura and Makoto Fujimaki

(Received July 2, 2018; Accepted August 27, 2018)

Keywords: near-field light, fluorescent assay, immunoassay, total internal reflection

In this research, we apply the near field excited by waveguide mode (WGM) to the illumination of a total internal reflection fluorescence (TIRF) microscope. By utilizing the electric field enhancement by WGM, we can replace the laser light source with a low-output light source such as an LED. By measuring the reflection spectra of the WGM chip whose surface was covered with cells, the effect of the cell on the reflection spectra was evaluated. On the basis of the evaluation, we designed an asymmetric trapezoidal prism to excite two fluorescent dyes with different excitation wavelengths on a single WGM chip. By using the trapezoidal prism with different base angles to enhance each wavelength, enhanced fluorescence observations using two fluorescent dyes with a simple optical system became possible. In this optical system, the observation of cultured cells, whose cytoskeleton and nuclei were separately stained with two fluorescent dyes, was carried out. It was confirmed that the fluorescence of each dye was effectively enhanced at both wavelengths.

Corresponding author: Makoto Fujimaki

This work is licensed under a Creative Commons Attribution 4.0 International License.

Cite this article
Masato Yasuura and Makoto Fujimaki, Waveguide-mode Illumination for Enhanced Fluorescent Microscopy, Sens. Mater., Vol. 31, No. 1, 2019, p. 63-70.