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Microscopía Fototérmica de Partícula Única Utilizando Resonadores de Micranillo de Nitruro de Silicio en Chip

Yulia Podorova¹, Cecilia H Vollbrecht¹, Samantha J Evans¹

¹Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, Wisconsin 53706, United States.

The journal of physical chemistry. A

|December 24, 2025

Abstract:

Optical microresonators confine light in time and space, enabling high sensitivity for the detection of small thermal perturbations. We utilized these properties and investigated on-chip integrated silicon nitride microring resonators (MRRs) for single-particle photothermal microscopy. We calibrate the technique using individual nonphotoluminescent carbon nanotubes and determine values for absorption cross-section per atom that agree with literature values. Finite-element simulations are performed to track all relevant thermal gradients. The combination of experiment and simulation allows for discussion of the benefits and drawbacks of the planar MRR geometry for single-particle microscopy.

Palabras clave:

microscopía fototérmica resonadores de micranillo nitruro de silicio nanotecnología nanosensores

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