22. October 2024, 16:00 until 17:00

S. Schmid, TU Wien, Institute of Sensor and Actuator Systems

Seminar

Photothermal sensing near the fundamental sensitivity limit with nanomechanical resonators

Photothermal sensing is a highly sensitive technique that detects minute temperature changes caused by the absorption of light, resulting in thermal expansion or refractive index variations within a material. This capability makes photothermal sensing invaluable in applications like chemical analysis, biological detection, and material characterization. The fundamental sensitivity limit of photothermal sensors is governed by the fluctuation-dissipation theorem. Traditional photothermal sensors, such as thermal infrared detectors, rely on thermoelectric effects and are ultimately constrained by Johnson noise. In contrast, nanomechanical resonators offer a means to measure temperature changes mechanically, circumventing the Johnson noise limit. This study examines how noise processes, including thermomechanical noise and temperature fluctuations, influence the photothermal sensitivity of nanomechanical resonators. We explore the current limitations and propose pathways to advance from current single nanoparticle to single molecule spectroscopy.

Calendar entry

Event location

SEM.R. DB gelb 05 B
1040 Wien
Wiedner Hauptstraße 8-10/E134

 

Organiser

IAP
Manuela Marik
marik@iap.tuwien.ac.at

 

Public

Yes

 

Entrance fee

No

 

Registration required

No