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Nano Letter - 超穎介面新突破 (黃承彬老師研究群)

本所黃承彬老師研究群,於近期首度展示了利用不攜帶任何角動量的遠場線性偏振激發光,就能夠在一個金薄膜超穎介面上,創造出攜帶軌域角動量的近場電漿子漩渦。此一可能性歸結於團隊對超穎介面設計上的全新觀點,突破了過往超穎介面元件停留在遠場激發、遠場量測的框套。本論文中提出了完整的原創設計理念、數值模擬、以及近場光學之實驗證據。本項工作中的近場光學實驗成果獲得了所有論文審稿人的極力推崇。黃老師研究群預期此一突破,將可在光學捕捉、光驅轉動、分子與生物分類等多項尖端技術上獲得廣泛的實用性。

更深入報導請參閱 http://web.ee.nthu.edu.tw/files/14-1030-85152,r2471-1.php

 

 

 

Recent breakthrough in near-field vortex creation using a metasurface by Prof. C-.B Huang’s group is published in Nano Letters

 

Nanocavities inscribed in a gold thin film are optimized and designed to form a metasurface. We demonstrate both numerically and experimentally the creation of surface plasmon (SP) vortex carrying orbital angular momentum in the metasurface under linearly polarized optical excitation that carries no optical angular momentum. Moreover, depending on the orientation of the exciting linearly polarized light, we show that the metasurface is capable of providing dynamic switching between SP vortex formation or SP subwavelength focusing. The resulting SP intensities are experimentally measured using a near-field scanning optical microscope and are found in excellent quantitative agreements as compared to the numerical results.

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