Photothermally Induced Natural Vibration for Versatile and High-speed Actuation of Crystals

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Mar 13

PMID 36907883

Authors

Yuki Hagiwara

Shodai Hasebe

Hiroki Fujisawa

Junko Morikawa

Toru Asahi

Hideko Koshima

Affiliations

Soon will be listed here.

Abstract

The flourishing field of soft robotics requires versatile actuation methodology. Natural vibration is a physical phenomenon that can occur in any material. Here, we report high-speed bending of anisole crystals by natural vibration induced by the photothermal effect. Rod-shaped crystal cantilevers undergo small, fast repetitive bending (~0.2°) due to natural vibration accompanied by large photothermal bending (~1°) under ultraviolet light irradiation. The natural vibration is greatly amplified by resonance upon pulsed light irradiation at the natural frequency to realise high frequency (~700 Hz), large bending (~4°), and high energy conversion efficiency from light to mechanical energy. The natural vibration is induced by the thermal load generated by the temperature gradient in the crystal due to the photothermal effect. The bending behaviour is successfully simulated using finite element analysis. Any light-absorbing crystal can be actuated by photothermally induced natural vibration. This finding of versatile crystal actuation can lead to the development of soft robots with high-speed and high-efficient actuation capabilities.

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