Femtosecond laser textured porous nanowire structured glass for enhanced thermal imaging

Tingni Wu; Zhipeng Wu; Yuchun He; Zhuo Zhu; Lingxiao Wang; Kai Yin

doi:10.3788/COL202220.033801

Journals >Chinese Optics Letters >Volume 20 >Issue 3 >Page 033801 > Article

Chinese Optics Letters
Vol. 20, Issue 3, 033801 (2022)

Femtosecond laser textured porous nanowire structured glass for enhanced thermal imaging | On the Cover

Tingni Wu¹, Zhipeng Wu¹, Yuchun He¹, Zhuo Zhu¹, Lingxiao Wang¹, and Kai Yin^1、2、*

Author Affiliations

¹Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, China

²State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

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DOI: 10.3788/COL202220.033801 Cite this Article

Tingni Wu, Zhipeng Wu, Yuchun He, Zhuo Zhu, Lingxiao Wang, Kai Yin. Femtosecond laser textured porous nanowire structured glass for enhanced thermal imaging[J]. Chinese Optics Letters, 2022, 20(3): 033801 Copy Citation Text

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Abstract

Infrared (IR) thermal imaging has aroused great interest due to its wide application in medical, scientific, and military fields. Most reported approaches for regulating thermal radiation are aimed to realize IR camouflage and are not applicable to enhance thermal imaging. Here, we introduce a simple and effective method to process porous glass by femtosecond laser scanning, where distributed nanocavities and nanowires were produced, which caused improvement of the treated glass emissivity. The as-prepared sample possessed better IR thermal radiation performance but lower transmittance to visible light. We also demonstrated its applicability by placing it in different backgrounds, where the IR image temperature of laser-treated glass was closer to the actual environment, and this strategy may provide a new vision for enhanced thermal imaging.

Keywords

femtosecond laser glass micro/nanostructures texture thermal radiation

1. Introduction

Any object with a temperature higher than absolute zero will emit thermal radiation as stated in Planck’s law^[1]. According to the Stefan–Boltzmann law, the total thermal energy radiated from the surface of an object is proportional to the emissivity $ε$ and the fourth power of the temperature. Thus, the infrared (IR) imaging can be controlled by either regulating the emissivity or changing the surface temperature. In nature, many organisms achieve better survival by adjusting their own IR radiation^[2–4]. Inspired by natural creatures, imitate biological regulation of surface heat radiation to achieve personal thermal management^[5,6], IR camouflage^[7,8], IR radiation cooling^[9,10], and other functions^[11–13] has received widespread attention.