可調(diào)諧光學回音壁模式微腔實驗研究
[Abstract]:In recent years, echo wall mode (Whispering Gallery mode,WGM) based on optical microcavity has attracted many scholars' interest. Tunable echo wall mode is of great value in filtering, optical switching and sensing measurement. In this paper, the resonant frequency and amplitude tuning of echo wall mode are studied using microtubules and photonic crystal fibers as optical resonators, respectively, using the good thermo-optical effect, free carrier particle absorption and multi-photon absorption effect of silicon based materials. The main research contents are as follows: 1 Transmission matrix method is used to analyze the transmission characteristics of microtube resonator oscillation frequency, and the echo wall mode of micro-fiber near-field coupling excited resonator is simulated by using finite element theory and COMSOL software theory. The effects of coupling distance and wall thickness of microtubules on the resonant mode are studied. The effects of coupling distance and polarization state of light wave on the mode of echo wall are experimentally studied. 2 the tunable resonator of echo wall mode is fabricated by using silicon dioxide microtubules and electric heating wire. The theoretical derivation shows that electrothermal tuning can realize the large-scale tuning of the echo wall mode. The experimental results show that the quality factor of the resonator is 10 ~ 4 orders of magnitude, the free spectrum range is 0.8nm and the signal-to-noise ratio (SNR) is as high as 4.3 dB. Through the constant current of electric heating wire, the 0.57nm drift of echo wall mode is realized. The corresponding current is 200mA, and the electric power consumed is about 0.1m W; The experimental results show that the response speed of the tunable electric resonator is in the order of several hundred ms when it is used as an optical switch. It is theoretically analyzed that the response speed can be improved by reducing the wall thickness of microtubules and increasing the length of microtubules. 3 it is proposed to use photonic crystal fibers as optical microcavities to obtain high Q and less mode echo wall modes. Six photonic crystal fibers with large holes were used to obtain the WGM and Fano modes with a Q value of 104.The model volume is smaller than that of silica microtubules. The amplitude light tuning of the optical echo wall mode and the Fano mode is realized by using the multiphoton absorption and the free carrier particle absorption effect. The mode field distribution of photonic crystal fiber as resonator is simulated theoretically, and the Fano mode produced by photonic crystal fiber is preliminarily explained. The low order echo wall mode is coupled on the outer edge of the cavity, and the Fano echo wall mode is finally formed. In conclusion, the thermo-optical nonlinear effect can achieve a large range of echo wall mode tuning. The absorption of free-loaded particles and multi-photon absorption results in the increase of loss and the decrease of resonant mode amplitude. The special structure of photonic crystal fiber leads to the formation of Fano echo wall mode. The two kinds of echo-wall tuners designed in this paper have certain application value in tunable lasers, optical filters and optical switches.
【學位授予單位】:重慶大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN253
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