Comparative Analysis of Nanomechanical Resonators: Sensitivity, Response Time, and Practical Considerations in Photothermal Sensing

TL;DR

This paper compares different nanomechanical resonator designs for photothermal sensing, analyzing their sensitivity, response time, and stability to guide future sensor development.

Contribution

It provides a comprehensive comparison of strings, drumheads, and trampolines, revealing their respective advantages and limitations in photothermal sensing applications.

Findings

Strings have the highest sensitivity with 280 fW/Hz$^{1/2}$ noise equivalent power.

Drumheads show the fastest thermal response among the tested resonators.

Photothermal sensitivity correlates with average temperature rise, not peak temperature.

Abstract

Nanomechanical photothermal sensing has significantly advanced single-molecule/particle microscopy and spectroscopy, and infrared detection through the use of nanomechanical resonators that detect shifts in resonant frequency due to photothermal heating. However, the relationship between resonator design, photothermal sensitivity, and response time remains unclear. This paper compares three resonator types - strings, drumheads, and trampolines - to explore this relationship. Through theoretical modeling, experimental validation, and finite element method simulations, we find that strings offer the highest sensitivity (with a noise equivalent power of 280 fW/Hz$^{1/2}$ for strings made of silicon nitride), while drumheads exhibit the fastest thermal response. The study reveals that photothermal sensitivity correlates with the average temperature rise and not the peak temperature. Finally, the impact of photothermal back-action is discussed, which can be a major source of frequency instability. This work clarifies the performance differences and limits among resonator designs and guides the development of advanced nanomechanical photothermal sensors, benefiting a wide range of applications.