Photothermal control of whispering gallery mode lasing in polymer-coated silica microcavity using high-efficiency nanohe
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Photothermal control of whispering gallery mode lasing in polymer-coated silica microcavity using highefficiency nanoheater Hanyang Li1,2, Xiaolei Hao1,2, Yanzeng Li3, Rui Duan1,2, Tingting Zhang1,2, Jin Li1,2, Yonggui Yuan1,2, and Lu Liu1,2,* 1
College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China Key Lab of In-Fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China 3 Department of Physics and Optical Science, University of North Carolina at Charlotte, Charlotte, NC 28223-0001, USA 2
Received: 9 June 2020
ABSTRACT
Accepted: 1 September 2020
Photothermal control has been widely used in the tuning of microelectronic devices due to its laser-assisted noncontact manipulation and cost-effective advantages. The Nd3? heavily doped NaGdF4 nanocrystals (NCs) were proposed as a heat source at nanoscale, and its light-to-heat conversion efficiency was evaluated to be above 80%. Here, we obtained a whispering gallery mode lasing emission from the prepared polymer-coated silica microcavity under a 532 nm pulsed laser. The nanoheaters are combined with the microcavity to trigger the photothermal effect at the irradiation of a second 793 nm continuous wave (CW) laser, thereby realizing all-optical tuning of the resonance wavelength by changing the effective refractive index of the microcavity. By measuring the shift of lasing modes on exposure to CW laser with different power intensities, the maximum tuning range and sensitivity of 2 nm and 1.96 nm/ (Wmm-2) were achieved as the power intensity increased from 0 to 1.02 W/ mm2. Our work provides a method for developing a new generation of alloptical tunable lasers based on nanoscale photothermal effect.
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Springer Science+Business
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Handling Editor: Maude Jimenez.
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https://doi.org/10.1007/s10853-020-05272-4
J Mater Sci
GRAPHIC ABSTRACT
Introduction Organic micro/nanostructures with excellent optoelectronic characteristics have attracted great attention because of their broad application prospects in various electronic devices, such as field-effect transistors, electroluminescent (EL) devices and organic light-emitting diodes [1–3]. In particular, high-quality organic optical microcavities, which mainly include Fabry–Perot (F-P) mode microresonators and whispering gallery mode (WGM) microresonators, are fascinating [4]. For WGM microresonator, photons are efficiently confined to the microcavity for a long time through continuous total internal reflection, thereby achieving strong light–matter interaction and high quality (Q) factor [5]. So far, most inorganic WGM microresonators can be prepared by sophisticated top-down processing techniques [6, 7], which restricts their applications. Compared with inorganic semiconductor structures, organic structures have been constructed at room temperature by simple selfassembly solution methods, such as birefringence WGM cavity based on liqu
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