Position-sensitive photodetector for plasmonic detection in a random metasurface

Carla N. Labastida; Juan P. Cuanalo; Irving Gazga; Rubén Ramos; Svetlana Mansurova; Nikolai Korneev

doi:10.1117/12.2677359

5 October 2023 Position-sensitive photodetector for plasmonic detection in a random metasurface

Carla N. Labastida, Juan P. Cuanalo, Irving Gazga, Rubén Ramos, Svetlana Mansurova, Nikolai Korneev

Proceedings Volume 12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI; 126480G (2023) https://doi.org/10.1117/12.2677359
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Conference Poster

Abstract

In this work, we have developed a refractive index change sensing system utilizing localized surface plasmon resonance (LSPR) transduction, combined with a position-sensitive photodetector (PSPD). As the transducers, we utilized gold nano-islands formed through thermal annealing of an Au film with a nominal thickness of 13 nm. The LSPR was excited by evanescent wave in an attenuated total reflectance configuration. Refractive index changes result in modifications across the angular spectrum of LSPR, giving rise to variations in the differential signal detected between the two quadrants of the photodetector. We determined the refractive index resolution of our sensing system at different wavelengths and performed a comparative analysis with traditional surface plasmon resonance (SPR) transducers and available literature data. While LSPR transducers demonstrate a lower refractive index resolution (RIR) compared to SPR, the approach presented in this work stands out when compared to other LSPR sensing methods. Notably, at a wavelength of 785 nm, it achieves a remarkable RIR of 1.4 × 10⁻⁶ RIU.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Carla N. Labastida, Juan P. Cuanalo, Irving Gazga, Rubén Ramos, Svetlana Mansurova, and Nikolai Korneev "Position-sensitive photodetector for plasmonic detection in a random metasurface", Proc. SPIE 12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI, 126480G (5 October 2023); https://doi.org/10.1117/12.2677359

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