【摘要】：近年來(lái),基于光學(xué)微腔的回音壁模式(Whispering Gallery mode,WGM)吸引了眾多學(xué)者的研究興趣。可調(diào)諧的回音壁模式在濾波、光開(kāi)關(guān)和傳感測(cè)量中有著極其重要的價(jià)值。本文利用硅基材料良好的熱光效應(yīng)、自由載粒子吸收和多光子吸收效應(yīng),分別以微管和光子晶體光纖作為光學(xué)諧振腔,對(duì)回音壁模式的諧振頻率和幅度調(diào)諧進(jìn)行了研究。主要的研究?jī)?nèi)容如下:①采用傳輸矩陣法分析微管諧振腔振蕩頻率的傳輸特性,并利用有限元原理和COMSOL軟件理論仿真微光纖近場(chǎng)耦合激發(fā)諧振腔的回音壁模式,研究了耦合距離和微管壁厚對(duì)諧振模式的影響;實(shí)驗(yàn)研究了耦合距離和光波偏振態(tài)對(duì)回音壁模式的影響。②采用熔融拉錐技術(shù),利用二氧化硅微管和電熱絲制作可調(diào)諧的回音壁模式電諧振腔,理論推導(dǎo)得知電致熱調(diào)諧可以實(shí)現(xiàn)回音壁模式的大范圍調(diào)諧;實(shí)驗(yàn)測(cè)試電諧振腔獲得品質(zhì)因數(shù)104數(shù)量級(jí),自由光譜范圍為0.8nm以及信噪比高達(dá)4.3d B的回音壁模式;通過(guò)對(duì)電熱絲通以恒定電流,實(shí)現(xiàn)回音壁模式0.57nm的漂移,對(duì)應(yīng)的電流大小為200m A,消耗的電功率約為0.1m W;實(shí)驗(yàn)測(cè)試可調(diào)諧電諧振腔作為光開(kāi)關(guān)時(shí),響應(yīng)速度在幾百ms數(shù)量級(jí)上,理論分析通過(guò)減少微管壁厚和增加微管長(zhǎng)度可以提高響應(yīng)速度。③提出利用光子晶體光纖作為光學(xué)微腔獲得高Q、少模的回音壁模式。實(shí)驗(yàn)通過(guò)六個(gè)大孔的光子晶體光纖,獲得Q值為104數(shù)量級(jí)的WGM和Fano模式,模式體積較二氧化硅微管少,并利用多光子吸收和自由載粒子吸收效應(yīng)實(shí)現(xiàn)對(duì)光學(xué)回音壁模式和Fano模式的幅度光調(diào)諧;理論仿真光子晶體光纖作為諧振腔的模場(chǎng)分布,初步解釋光子晶體光纖產(chǎn)生的Fano模式,孔狀結(jié)構(gòu)致使腔體內(nèi)的高階模式被損耗,低階的回音壁模式在腔體外沿發(fā)生模式耦合效應(yīng),最終形成Fano回音壁模式。綜上,熱光非線性效應(yīng)能夠?qū)崿F(xiàn)超大范圍的回音壁模式調(diào)諧,自由載粒子吸收和多光子吸收致使腔內(nèi)損耗增加,諧振模式幅度減少;光子晶體光纖的特殊結(jié)構(gòu)致使Fano回音壁模式的形成。本文所設(shè)計(jì)的兩類回音壁模式可調(diào)諧器件在可調(diào)諧激光器、光濾波以及光開(kāi)關(guān)等領(lǐng)域具有一定的應(yīng)用價(jià)值。
[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(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

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