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  • Received: Apr. 9, 2018

    Accepted: Jun. 6, 2018

    Posted: Jan. 17, 2019

    Published Online: Aug. 2, 2018

    The Author Email: Chunxiang Xu (xcxseu@seu.edu.cn)

    DOI: 10.3788/COL201816.081401

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    Wei Xu, Chunxiang Xu, Feifei Qin, Yaqi Shan, Zhu Zhu, Ye Zhu. Whispering-gallery mode lasing from polymer microsphere for humidity sensing[J]. Chinese Optics Letters, 2018, 16(8): 081401

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(a) Schematic diagram of the growth mechanism of the PS/DCM microspheres. (b) Schematic diagram for the optical measurement.

Fig. 1. (a) Schematic diagram of the growth mechanism of the PS/DCM microspheres. (b) Schematic diagram for the optical measurement.

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(a) The top view and (b) 45° view of SEM images of DCM-doped polymer microspheres.

Fig. 2. (a) The top view and (b) 45° view of SEM images of DCM-doped polymer microspheres.

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(a) The PL emission of a typical DCM-doped polymer microsphere recorded as a function of excitation density. (b) The emission intensity dependence on the excitation density. The inset in (b) is the corresponding fluorescent microsphere image (3.7 μm). (c) The relationship between λ2/Δλ and the diameter of the microsphere. (d) Lasing spectra of polymer microspheres with different diameters. The corresponding mode numbers are given in (d).

Fig. 3. (a) The PL emission of a typical DCM-doped polymer microsphere recorded as a function of excitation density. (b) The emission intensity dependence on the excitation density. The inset in (b) is the corresponding fluorescent microsphere image (3.7 μm). (c) The relationship between λ2/Δλ and the diameter of the microsphere. (d) Lasing spectra of polymer microspheres with different diameters. The corresponding mode numbers are given in (d).

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(a) Experimental and simulated lasing spectra of individual sphere with a diameter of 3.7 μm. The inset shows the PL spectrum of DCM-doped PS film. (b) Electronic field distribution of resonance wavelength.

Fig. 4. (a) Experimental and simulated lasing spectra of individual sphere with a diameter of 3.7 μm. The inset shows the PL spectrum of DCM-doped PS film. (b) Electronic field distribution of resonance wavelength.

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(a) Schematic diagram of PL measurement under different RH. (b) Wavelength shift of the lasing mode under the exposure of different RH.

Fig. 5. (a) Schematic diagram of PL measurement under different RH. (b) Wavelength shift of the lasing mode under the exposure of different RH.

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(a) Normalized simulated lasing spectra of PS sphere with refractive index variation. (b) Relationship between wavelength shift and refractive index variation.

Fig. 6. (a) Normalized simulated lasing spectra of PS sphere with refractive index variation. (b) Relationship between wavelength shift and refractive index variation.

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Experimentally measured spectra taken from the PS microsphere before and after the water vapor treatment.

Fig. 7. Experimentally measured spectra taken from the PS microsphere before and after the water vapor treatment.

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