8.5um量子阱紅外探測器的光學天線優(yōu)化
發(fā)布時間：2019-02-09 13:55
【摘要】：自上世紀90年代以來,量子阱紅外探測器作為一個探索方向,成為探測領域的一個新興研究熱點,相對于傳統(tǒng)的紅外探測器。通過改變材料組分、調(diào)節(jié)量子阱指標-阱深、勢壘高度,QWIP實現(xiàn)對目標波長的探測。但由于同導帶(或價帶)內(nèi)不同子帶間的躍遷與光極化方向密切相關(guān),QWIP對光的入射方向要求苛刻,研究的一個方向在于將更多的入射光耦合進量子阱。自QWIP誕生以來,各種耦合方式被提出。本文中提出一種二維光學天線耦合方式,將遠場能量有效的耦合到量子阱感光區(qū)域,提高QWIP的探測效率。該光學天線是一種基于表面等離子共振(SPR)的金屬薄膜,利用薄膜上的周期孔列實現(xiàn)入射光對金屬表面電子激發(fā)共振,增強局域電場。光學天線的各項指標尺寸與探測波長位于同一數(shù)量級,FDTD計算方法適合這一模型,故本文使用FDTD Solution對提出的光學天線性能進行仿真,優(yōu)化二維光學天線的各項結(jié)構(gòu)參數(shù),實現(xiàn)探測中心波長為8.5um的最佳光學天線。
[Abstract]:Since the 1990s, the quantum well infrared detector has become a new research hotspot in the field of exploration as a direction of exploration, compared with the traditional infrared detector. By changing the composition of the material and adjusting the well depth and barrier height, the target wavelength can be detected by QWIP. However, the transition between different subbands in the homoconductive band (or valence band) is closely related to the direction of optical polarization, and the direction of incident light is demanding by QWIP. One direction of study is to couple more incident light into quantum wells. Since the birth of QWIP, various coupling methods have been proposed. In this paper, a two-dimensional optical antenna coupling method is proposed. The far-field energy is effectively coupled to the sensitive region of the quantum well to improve the detection efficiency of QWIP. The optical antenna is a kind of metal film based on surface plasmon resonance (SPR). The incident light is used to excite the electron resonance on the metal surface using periodic holes in the film and the local electric field is enhanced. Each index size of the optical antenna is in the same order of magnitude as the detection wavelength, and the FDTD calculation method is suitable for this model. Therefore, the performance of the proposed optical antenna is simulated by FDTD Solution in this paper, and the structural parameters of the two-dimensional optical antenna are optimized. The optimal optical antenna with the detection center wavelength of 8.5um is realized.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN215
本文編號：2419022
[Abstract]:Since the 1990s, the quantum well infrared detector has become a new research hotspot in the field of exploration as a direction of exploration, compared with the traditional infrared detector. By changing the composition of the material and adjusting the well depth and barrier height, the target wavelength can be detected by QWIP. However, the transition between different subbands in the homoconductive band (or valence band) is closely related to the direction of optical polarization, and the direction of incident light is demanding by QWIP. One direction of study is to couple more incident light into quantum wells. Since the birth of QWIP, various coupling methods have been proposed. In this paper, a two-dimensional optical antenna coupling method is proposed. The far-field energy is effectively coupled to the sensitive region of the quantum well to improve the detection efficiency of QWIP. The optical antenna is a kind of metal film based on surface plasmon resonance (SPR). The incident light is used to excite the electron resonance on the metal surface using periodic holes in the film and the local electric field is enhanced. Each index size of the optical antenna is in the same order of magnitude as the detection wavelength, and the FDTD calculation method is suitable for this model. Therefore, the performance of the proposed optical antenna is simulated by FDTD Solution in this paper, and the structural parameters of the two-dimensional optical antenna are optimized. The optimal optical antenna with the detection center wavelength of 8.5um is realized.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN215
【參考文獻】
相關(guān)期刊論文 前1條
1 趙昆;楊希峰;;AlGaAs/GaAs量子阱探測器的吸收光譜研究[J];紅外;2013年07期
，本文編號：2419022
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