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  • 我校納米光子學團隊在局域超手性光場研究領域取得突破

    時間:2019-07-02瀏覽:360編輯:李卉云攝影:    通訊員:設置

    近日,莊松林院士領導的未來光學國際實驗室納米光子學團隊在局域超手性光場研究領域取得突破性進展。

    手性是物體的三維特征,具有手性的物體的鏡像與其本身無法重合。組成生命體的許多重要分子,如核酸、氨基酸和酶等都是手性分子。同時,許多藥物的有效成分也均為手性分子,手性相反的同分異構體可能具有完全不同的生物活性,甚至一種手性分子具有治療效果,而具有相反手性的分子卻會對人體產生毒性。因此對手性藥物分子必須進行嚴格的識別和分離。

    由于圓偏光也具有手性,圓偏二色測量被廣泛用于分子手性的分析。但分子結構尺寸在納米量級,而光波長為百納米量級,兩者在尺度上的失配導致傳統的圓偏二色測量技術通常是對某個特定區域的大量分子平均手性進行分析,無法對樣品進行高空間分辨率測量。2010年,哈佛大學A. E. Cohen等提出采用手性大于圓偏振光的光場(即超手性光場)顯著增強手性信號,然而實現高度局域化的超手性光場尚無報道。

    未來光學國際實驗室納米光子學團隊利用強聚焦系統光子軌道角動量與自旋角動量相互耦合的特性,經過適當的光學偏振調制,發現了在圓偏振光入射下產生高度局域化的超手性光場方法。研究表明,在聚焦透鏡焦點可以在λ/25(光波長的25分之一)的尺度內實現11.9倍于圓偏振光的光場手性增強。使用這一高度局域的超手性光場對手性樣品進行掃描,能夠獲得遠遠超過光學系統空間分辨率的分子手性及其在空間上分布的信息。更為重要的是本文提出的方法與傳統圓偏二色測量方法兼容,該技術將為無標記分子成像技術提供新的技術路線,在生物、醫藥等領域具有廣闊的應用前景。此研究成果發表于國際權威刊物物理學評論快報(H. Hu, Q. Gan, and Q. Zhan, Phys. Rev. Lett, 122, 223901 (2019))。本項工作得到光電學院、科技處和人事處的大力支持。

     

      深亞波長尺度的局域超手性光場效果圖


    供稿:光電學院

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