Physics

Non-Hermitian physics for optical manipulation uncovers inherent instability of large clusters

X. Li, Y. Liu, et al.

This groundbreaking research by Xiao Li, Yineng Liu, Zhifang Lin, Jack Ng, and C. T. Chan explores the inherent instability of optical trapping and binding in larger particle clusters, revealing how ambient damping is essential for maintaining stability in these optically bound formations. Uncover the complexities of many-particle limits and the intriguing dynamics at play.

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Abstract

Optical trapping and binding, while effective for small particle clusters, are inherently unstable for larger clusters due to non-Hermitian nature of optical forces. The study reveals that clusters with 10 or more particles exhibit prevalent unstable complex eigenvalues, a consequence of energy pumping from light exceeding the system's capacity. This instability is shown to be inevitable in the many-particle limit. The presence of ambient damping, as in fluid environments, is crucial for maintaining stability in experimentally observed large optically bound clusters.

Publisher

Nature Communications

Published On

Nov 15, 2021

Authors

Xiao Li, Yineng Liu, Zhifang Lin, Jack Ng, C. T. Chan

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