本文選題：亞波長光柵 + 側(cè)面耦合技術(shù)　； 參考：《浙江大學》2015年碩士論文

【摘要】：利用光柵側(cè)面耦合技術(shù)多為單波長或窄帶光耦合,用于光纖激光器泵浦、光波導集成等領(lǐng)域,而用于可見光寬帶耦合的研究很少。通過在波導上集成亞波長衍射光柵結(jié)構(gòu),可以引導太陽光在波導的側(cè)面進行出光匯集,因此可以作為一種新型的太陽能集光器結(jié)構(gòu)。本文主要就是研究這種基于光柵側(cè)面耦合的寬光帶集光技術(shù)。在理論分析中,除了對光柵耦合原理進行了闡述,還詳述了矢量衍射理論中的時域有限差分法和嚴格耦合波法,并分別對其麥克斯韋方程組進行了求解,為之后的光柵結(jié)構(gòu)優(yōu)化仿真等內(nèi)容奠定了理論基礎(chǔ)。亞波長光柵結(jié)構(gòu)參數(shù)影響衍射耦合效率,從而影響波導側(cè)面收集的能量。通過FDTD軟件對光柵結(jié)構(gòu)參數(shù)進行掃描仿真,再利用快速下降法獲得不同類型不同面形的最佳光柵結(jié)構(gòu),并利用RCWA法對其中的矩形相位光柵結(jié)構(gòu)進行了驗證。不同的入射角對集光器影響較大,因此本文對不同入射角下的衍射耦合效率也進行了仿真分析。耦合光在波導內(nèi)通過全反射傳播,當光傳播到波導與光柵的交界面處發(fā)生透射衍射,造成能量的泄露。利用FDTD軟件對幾種耦合波長下的一次傳播泄露進行了計算,并在矩形相位光柵中,對耦合波長為420nm的最大傳播距離以及側(cè)面耦合的能量與波導長度的關(guān)系進行了計算分析。由于光傳播損失嚴重,對高對比度的金屬光柵提出了改進方案。
[Abstract]:The side-coupling technology of grating is mostly single-wavelength or narrow-band optical coupling, which is used in the fields of fiber laser pumping and optical waveguide integration. However, there is little research on wide-band coupling of visible light. By integrating the subwavelength diffraction grating structure on the waveguide, the solar light can be induced to collect light on the side of the waveguide, so it can be used as a new type of solar collector structure. In this paper, we mainly study the wide-band light collecting technology based on grating side-coupling. In the theoretical analysis, in addition to explaining the principle of grating coupling, the finite difference time-domain method and the strictly coupled wave method in vector diffraction theory are described in detail, and their Maxwell equations are solved respectively. It lays a theoretical foundation for the optimization and simulation of grating structure. The structural parameters of the subwavelength grating affect the diffraction coupling efficiency, thus affecting the energy collected on the side of the waveguide. The structural parameters of the grating are scanned and simulated by FDTD software. The optimal grating structures with different types and different plane shapes are obtained by using the fast descent method, and the rectangular phase grating structure is verified by the RCWA method. The diffractive coupling efficiency at different incident angles is also simulated and analyzed. The coupled light propagates through the total reflection in the waveguide, and when the light propagates to the interface between the waveguide and the grating, the transmission and diffraction take place, which results in the energy leakage. The primary propagation leakage at several coupling wavelengths is calculated by using the FDTD software. The relationship between the maximum propagation distance of the coupled wavelength and the side coupling energy and the waveguide length in rectangular phase grating is calculated and analyzed. Due to the serious loss of light propagation, an improved scheme for high contrast metal gratings is proposed.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK513.1;TN253

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本文編號：2031521