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Research Article

Printable microlaser arrays with programmable modes for information encryption

Jun RuanDan Guo( )Kun GeZhiyang XuFangyuan LiuTianrui Zhai( )
College of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China
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Graphical Abstract

We propose a design of printable optical encryption microlaser arrays chips by modulating the whispering gallery mode (WGM) microlaser polarization modes spacing through programming the effective refractive index of the resonant microcavities.

Abstract

Lasing emissions with multiple and tunable modes are promising in coding field as a novel cryptographic primitive. With the advantages of simple fabrication, full-color and high-quality-factor whispering gallery mode lasing inside a circular cross-section, polymer microfibers are attractive for photonic devices. However, polymer lasing microfibers for information encryption have never been reported. Herein, we propose a design of printable lasing microfiber encryption chip by in-situ tuning the effective refractive index of the microresonator arrays via a facile approach. Through inkjet printing high-refractive-index nanoparticles on the designated position of lasing microfiber arrays, the effective refractive index of the microcavities is regulated, and the ratio of wavenumber spacing between transverse electric and transverse magnetic mode to the free spectral range can be modulated, particularly with neglectable influence by the size factor. Thus, the programmable region selective encoding process can be conducted simply by a printing program within several minutes. Besides, the encoded microfiber arrays are encapsulated into polydimethylsiloxane to reduce the scattering loss and environmental interference, and a printable encryption chip is realized. This work is expected to provide a platform for the printable encrypted devices.

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Nano Research
Pages 10100-10107
Cite this article:
Ruan J, Guo D, Ge K, et al. Printable microlaser arrays with programmable modes for information encryption. Nano Research, 2023, 16(7): 10100-10107. https://doi.org/10.1007/s12274-023-5709-8
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Received: 12 February 2023
Revised: 28 March 2023
Accepted: 05 April 2023
Published: 20 June 2023
© Tsinghua University Press 2023
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