Second-harmonic generation from an optically levitated KTP nanocrystal in vacuum
Abstract
The optically levitated system in vacuum has emerged as a powerful platform for studies of fundamental physics and precision measurements. Although various nanoparticles have been successfully levitated in vacuum, they typically lack the capability to support optical nonlinear processes. Here, we experimentally demonstrate the stable levitation of a potassium titanyl phosphate (KTP) nonlinear nanocrystal in vacuum and investigate its second-harmonic generation (SHG) properties. This levitated system intrinsically provides a pristine dark-background environment with a high signal-to-noise ratio. The trapping laser simultaneously serves as a fundamental light for efficient SHG. Moreover, the polarization of the collected SHG signal is correlated with that of the fundamental laser, providing clear evidence of the optical torque enabling controllable alignment of the nanocrystal with the driving field. Our work establishes a new route, to our knowledge, toward exploring nonlinear optical processes in vacuum levitation systems and designing novel nanodevices with high manipulation agility in a fully contact-free environment.
Versions
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BibTeX
@misc{jin2026secondharmonic,
title = {{Second-harmonic generation from an optically levitated KTP nanocrystal in vacuum}},
author = {Yuanbin Jin and Chenli Gao and Jiayu Feng and Yuxuan Hao and Xudong Yu and Jing Zhang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.02871},
eprint = {2607.02871},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.02871},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Second-harmonic generation from an optically levitated KTP nanocrystal in vacuum
AU - Yuanbin Jin
AU - Chenli Gao
AU - Jiayu Feng
AU - Yuxuan Hao
AU - Xudong Yu
AU - Jing Zhang
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2607.02871
UR - https://arxiv.org/abs/2607.02871
AB - The optically levitated system in vacuum has emerged as a powerful platform for studies of fundamental physics and precision measurements. Although various nanoparticles have been successfully levitated in vacuum, they typically lack the capability to support optical nonlinear processes. Here, we experimentally demonstrate the stable levitation of a potassium titanyl phosphate (KTP) nonlinear nanocrystal in vacuum and investigate its second-harmonic generation (SHG) properties. This levitated system intrinsically provides a pristine dark-background environment with a high signal-to-noise ratio. The trapping laser simultaneously serves as a fundamental light for efficient SHG. Moreover, the polarization of the collected SHG signal is correlated with that of the fundamental laser, providing clear evidence of the optical torque enabling controllable alignment of the nanocrystal with the driving field. Our work establishes a new route, to our knowledge, toward exploring nonlinear optical processes in vacuum levitation systems and designing novel nanodevices with high manipulation agility in a fully contact-free environment.
ER -