三維電漿環形矩超穎材料之研究

Abstract

環形結構在自然界中在生物分子、病毒、蛋白質中相當常見。環形矩因其訊號較一般偶極矩弱，而常被忽略。近年來，藉由超穎材料這種人造物質能將環形矩訊號放大，以便我們研究並探討。在文獻上的環矩形超穎材料的共振波段幾乎都落在微波範圍，因為在光學波段的環形矩超穎材料較難製作出來，必須克服金屬在光學波段中的焦耳損耗以及製程技術。本文藉由一啞鈴形金平板與兩個金棒彼此間的耦合，設計新型的環形矩超穎材料，利用有限元素分析法模擬，計算不同結構幾何參數與超穎材料多極矩輻射強度的影響，並以電子束二次對準曝光技術成功製作出由正向入射的方式，在光學波段激發環形矩共振，將環形矩超穎材料響應波長由微波波段拓展到光學波段，並透過多極矩輻射強度色散譜圖的計算及分析模擬結構磁場驗來證明並實現環形矩訊號的存在。

Toroidial structures in biomolecules, viruses, protein are quite common. People do not often to discuss toroidal moment because the signal is weaker than other common dipole moment. Recently, toroidal moments signal can be amplified by using such artificial substances metamaterials. In the literature, toroidal metamaterial resonance region almost in the microwave range, because it’s difficult to overcome Joule losses and process technology at the optical region. In this paper, we design a new toroidal metamaterials by use mutual coupling between a dumbbell-shaped gold plate with two gold bars. Use the finite element method simulation, computational geometry with different structures metamaterial multipole moments of the radiated power. Using second alignment e-beam lithography technology successfully fabricated sample, the toroidal metamaterial response wavelength by the microwave region expanded to optical wavelengths and radiated power through multipole moment strength calculation and analysis of the dispersion spectra simulated structural magnetic moments of experience to achieve the toroidal signal exists.