Yi Zhu, Anbo Guo, Xianglong Zeng. Photothermal Spectroscopy NH3 Detection Based on a Microfiber with Sub-Wavelength Dimension[J]. Acta Optica Sinica, 2023, 43(16): 1623026
- Acta Optica Sinica
- Vol. 43, Issue 16, 1623026 (2023)
Fig. 1. Simulation and characterization of micro-nano fiber. (a) Simulation of evanescent field and photothermal effect; (b) transmission spectrum of fabricated microfiber
Fig. 2. PTS gas detection system based on microfiber with sub-wavelength dimension. (a) Experimental setup; (b) microfiber guiding 660 nm visible laser
Fig. 3. Photothermal phase modulation and second harmonics. (a) Dynamic process when the pump light is off and on; (b) spectrum of phase modulation
Fig. 4. Evaluation of system performance by second harmonic signal. (a) Second harmonics corresponding to different NH3 volume fractions; (b) linear fitting of Vpp; (c) second harmonic waveform within 180 s (36 cycles); (d) Vpp within 30 cycles
Fig. 5. Influence of pump power on SNR. (a) Second harmonics corresponding to different pump power; (b) comparison between signals and 1σ noises at different pump power
Fig. 6. Ability to resist ambient vibration noise
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Table 1. Influence of pump power on SNR
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