Presentation Information

5:15 PM - 5:30 PM JST(8:15 AM - 8:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8p-B12-6]Deep-Ultraviolet Refractive Index Sensing Using Lossy Mode Resonance and Anomalous Dispersion of ITO Thin Films

〇(M2)Takumi Takayanagi¹, Ichiro Tanabe², Kazuaki Nakata¹, Takayoshi Kobayashi³, Eiji Tokunaga¹ (1.Tokyo Univ. of Sci., 2.Rikkyo Univ., 3.National Yang Ming Chiao Tung Univ.)

Keywords:

refractive index,deep ultraviolet,lossy mode resonance

We operated a lossy mode resonance (LMR), which arises in an ITO thin film, in the deep-ultraviolet region where the refractive-index dispersion of biomolecules can be probed. Using an ITO film on a sapphire prism in Kretschmann geometry, we observed near 270 nm a negative absorbance dip self-enhanced by ITO's own band-edge anomalous dispersion (~274 nm). The integrated intensity responded linearly to the refractive index varied through the concentration of aqueous glycerin solutions. We report the operating principle and its extension to biomolecule detection.

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