本文選題：微環(huán)諧振腔 + 傳感器　； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：光波導(dǎo)環(huán)腔傳感器具有靈敏度高、抗電磁干擾性強(qiáng)、微型化等優(yōu)點(diǎn)成為了目前熱門研究的傳感器件之一。其利用介質(zhì)中傳播的倏逝場來感應(yīng)環(huán)境折射率的變化,從而進(jìn)行生物探測。本文基于強(qiáng)度探測和波長探測方法,提出了兩種新型傳感器件,研究了其器件結(jié)構(gòu)和傳感特性,給出了優(yōu)化設(shè)計(jì)方案,在優(yōu)化設(shè)計(jì)下,提出的新型傳感器取得了優(yōu)良的性能。完成的主要研究工作如下：首先針對(duì)微型化、集成化、穩(wěn)定性好、靈敏度高的生物傳感探測,設(shè)計(jì)了一種新型的反饋式跑道型光學(xué)微環(huán)傳感器,該傳感器主要由U型反饋波導(dǎo)、跑道諧振腔和敏感環(huán)組成。采用傳輸矩陣方法推導(dǎo)了該傳感器的歸一化輸出光強(qiáng)公式,數(shù)值分析了傳輸損耗因子、自耦合因子和敏感環(huán)尺寸等對(duì)傳感靈敏度的影響性質(zhì)。根據(jù)分析結(jié)果對(duì)結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化,優(yōu)化結(jié)構(gòu)不僅可以輸出尖銳陡峭的非對(duì)稱法諾諧振光強(qiáng)譜線,還具有較高的法諾諧振光譜斜率,能更好的增強(qiáng)傳感靈敏度。在信噪比為30dB的測量系統(tǒng)中,優(yōu)化的反饋式跑道型光學(xué)微環(huán)傳感器的探測極限可以達(dá)到4.48×10名單位折射率。其次針對(duì)寬譜的波長探測型生物傳感應(yīng)用,設(shè)計(jì)了一種基于馬赫-曾德干涉(Mach-Zehnder Interference,MZI)結(jié)構(gòu)的可產(chǎn)生游標(biāo)效應(yīng)的雙微環(huán)諧振腔傳感器。其主要由兩個(gè)3dB耦合器、兩組雙直波導(dǎo)、一個(gè)敏感環(huán)和一個(gè)參考環(huán)組成。采用耦合模理論推導(dǎo)了該傳感器的歸一化輸出光強(qiáng)公式,分析了其光強(qiáng)輸出譜線性質(zhì)。仿真分析表明,該傳感器可輸出具有較大振幅的主諧振峰光強(qiáng)譜線,其主諧振峰可呈數(shù)字式移動(dòng),當(dāng)被探測物的有效折射率變化為探測極限的整數(shù)倍時(shí),主諧振峰的位置以步長λm成倍漂移。在優(yōu)化設(shè)計(jì)下,該傳感結(jié)構(gòu)可獲得6.732×10-5RIU的較低探測極限,靈敏度達(dá)到3.730×104nm/RIU,比傳統(tǒng)的雙直波導(dǎo)單微環(huán)諧振腔靈敏度高近52倍；當(dāng)使用帶寬為310nm的光源時(shí),可以探測的物質(zhì)有效折射率的變化范圍為0.0083,具有探測動(dòng)態(tài)范圍寬、探測極限低和靈敏度不易受自由光譜范圍影響等優(yōu)點(diǎn)。
[Abstract]:Optical waveguide ring cavity sensor has become one of the most popular sensor devices because of its high sensitivity, strong resistance to electromagnetic interference and miniaturization. It makes use of evanescent field propagating in medium to induce the change of environmental refractive index, so as to carry out biological detection. Based on the methods of intensity detection and wavelength detection, two new sensor devices are proposed in this paper. The structure and sensing characteristics of the sensor are studied, and the optimal design scheme is given. Under the optimal design, the new sensor has achieved excellent performance. The main research work is as follows: firstly, a new feedback runway optical microloop sensor is designed for the biosensor with miniaturization, integration, good stability and high sensitivity. The sensor is mainly composed of U-shaped feedback waveguide. Runway resonator and sensitive ring. The normalized output intensity formula of the sensor is derived by using the transfer matrix method. The effects of the transmission loss factor, the self-coupling factor and the size of the sensitive ring on the sensitivity of the sensor are numerically analyzed. According to the analysis results, the structure parameters are optimized. The optimized structure can not only output sharp and steep asymmetric Farno resonance intensity spectrum line, but also have a higher Fano resonance spectral slope, which can enhance the sensing sensitivity better. In the measurement system with 30dB signal to noise ratio, the detection limit of the optimized feedback runway optical microloop sensor can reach 4.48 脳 10 unit refractive index. Secondly, a dual-microring resonator sensor based on Mach-Zehnder interference MZI (Mach-Zehnder Interferenceer MZI) structure is designed for wide-spectrum wavelength detection biosensor applications. It consists of two 3dB couplers, two groups of double straight waveguides, a sensitive ring and a reference ring. The normalized output light intensity formula of the sensor is derived by using the coupling mode theory, and the properties of the light intensity output line of the sensor are analyzed. The simulation results show that the sensor can output the main resonant peak intensity line with large amplitude, and the main resonant peak can be moved digitally. When the effective refractive index of the detected object changes to an integer multiple of the detection limit, The position of the main resonance peak drifts exponentially with the step size 位 m. Under the optimized design, the sensing structure can obtain a lower detection limit of 6.732 脳 10-5RIU, with a sensitivity of 3.730 脳 10 ~ 4 nm / r, which is nearly 52 times higher than that of the conventional double-straight waveguide single-microloop resonator. When the light source with bandwidth of 310nm is used, The range of effective refractive index of detectable material is 0.0083, which has the advantages of wide detection dynamic range, low detection limit and low sensitivity influenced by free spectrum range.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN252;TP212

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 陳曜;何鵬程;卜天容;丁玉麗;韋以明;;高靈敏馬赫澤德環(huán)形諧振腔[J];上海交通大學(xué)學(xué)報(bào);2014年10期

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本文編號(hào)：1954541