| Microsphere resonator is the most popular whispering gallery mode optical resonator.Due to the high-quality factors(Q)and low mode volume,microsphere resonators have been widely used in many novel micro photonic devices.Microsphere resonator is also an ideal platform for basic research and application research.Theoretical and experimental research on the WGMs in a single silica microparticle resonator fabricated by chemical method are carried out.An all-fiber micro-displacement sensor based on the microparticle resonator is also demonstrated.The main contents of this thesis are as follows:Firstly,we have a brief introduction of the developing history about whispering gallery mode microresonators.We mainly introduce the research progress of the microsphere resonators.The distribution of the light field in a microsphere resonator is analyzed theoretically,both theoretical analysis and simulation calculation are performed to illustrate the principle of the microfiber and the coupling system.Secondly,a method of exciting and observing the WGMs in a single microparticle resonator is proposed,detailed operation progress and working principle are introduced.A low-cost,compact and relatively stable coupling system is demonstrated by directly attaching a single microparticle resonator to a microfiber.WGMs in a single silica microparticle resonator with the diameter of 10.6 ?m are observed and analyzed.Resonance dips with highest Q factors of 450 and extinction ratio of 15 dB are achieved.Finally,we propose an all-fiber micro-displacement sensor based on the single microparticle resonator.Displacement sensing is achieved based on the polarization changing of the signal light caused by the birefringence effect in the bending single standard optical fiber as well as the WGMs in the microparticle.The reversibility and repeatability are both experimental demonstrated in the thesis.Sensitivity of 33.5 dB/mm and resolution of 10 ?m with sensing range up to 400 ?m are achieved. |
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