Applied Physics Letters

Fiber-tip photothermal transducer with gold-coated multi-beam interferometric cavity for high sensitivity gas detection

S Sixiang Ran (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) W Wenjun Ni (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) C Chunyong Yang (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) Z Zhongke Zhao (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) Z Zhengshuo Jiang (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) Q Qiaosong Lin B Bingze He (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) R Ruiming Wu (Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,) P Perry Ping Shum

Abstract

The power-boosted laser transmitted via a fiber tip sinusoidally excites the target trace molecules, generating a photothermal (PT) effect. The Gaussian-distributed plane wave heats the medium adjacent to the Fresnel reflection surface. Meanwhile, a continuous probe light traverses the heating field, and the periodic temperature change then modulates the phase of the probe light. A multi-beam interferometer formed by aligning the Fresnel reflection surface to a gold-coated high-reflection surface possesses high resolution and sensitivity, significantly enhancing the detection performance. A well-established theoretical model of instantaneous PT transduction and optical phase modulation is employed to obtain the optimized interferometric configuration. To validate the effective interferometric phase transformation within the cavity, a comparison is made between the simple silicon cavity and the gold-coated cavity. The limitation of detection of such extrinsic fiber-tip PT sensors indicates one magnitude lower as compared to the conventional PT interferometric gas sensor with such robust and compact sensing designs. This work lays a solid foundation for future research on gas laser phase modulators and nonlinear laser–matter interactions.

Download PDF View Original
APA MLA Chicago BibTeX RIS

Article Details

Volume / Issue Vol. 126, Issue 6
Published February 10, 2025
ISSN 0003-6951
Publisher American Institute of Physics

Journal Info

Applied Physics Letters

American Institute of Physics
ISSN: 0003-6951 Physical Sciences

Authors (9)

S

Sixiang Ran

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

W

Wenjun Ni

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

C

Chunyong Yang

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

Z

Zhongke Zhao

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

Z

Zhengshuo Jiang

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

Q

Qiaosong Lin

B

Bingze He

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

R

Ruiming Wu

Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University 1 , Wuhan 430074,

P

Perry Ping Shum

Related Articles from this Journal

Interface engineering with an rGO electron extraction layer for high-efficiency and stable Cu2ZnSnS4-based photocathode

Zhenyan Xiao, Piao Zhang et al. Aug 2026 10.1063/5.0312010

Transmission diffuse EUV scattering by nanoscale Lamb waves in thin membranes

Alessandra Milloch, Naman Agarwal et al. Aug 2026 10.1063/5.0343558

Optimized Nb-doped SnO2 buffer layer for enhanced carrier extraction and Sb2S3 photovoltaic responses

Xinsheng Liu, Xiangyang Liu et al. Aug 2026 10.1063/5.0343471

Exceptionally high thermoelectric power factors at low temperatures in heavily doped p- and n-type Ge-rich Ge1−xSnx films

Masashi Kurosawa, Takayoshi Katase et al. Aug 2026 10.1063/5.0346412

Unlocking room-temperature magnetoelectricity in Ba1.5Sr1.5-based Z-type hexaferrites via magnetic anisotropy modulation

Huantong Wu, Jun Li et al. Aug 2026 10.1063/5.0314711