利用金超穎介面控制二維原子層材料二硒化鎢螢光之圓二色性

Abstract

本研究結合超穎介面與新穎的二維原子層二硒化鎢達成在低溫與室溫下控制二硒化鎢螢光的圓極化特性。二維原子層的二硒化鎢在低溫時螢光具有旋性，同時利用旋性超穎介面中的旋性共振模態調變，二硒化鎢螢光的圓二色性增強與反向皆可達成。而在室溫操作元件時，二硒化鎢將無法激發出旋性螢光，然而超穎介面的旋性共振模態提供足夠強的圓極化光選擇作用，因此，室溫操作下仍可觀察到元件的圓極化放光。我們這項工作結合了材料與結構兩端來達成旋性發光的控制，同時，材料與結構都是低維度的，因此整合元件體積將可微小化。此外，於室溫下仍具有旋性放光的特性，使得該元件更可貼近實際用途，例如光信息處理，以及晶片尺寸的生醫感測應用。

Circular polarized photoluminescence from two dimensional material Tungsten Diselenide (WSe2) atomic layer was manipulated with gold chiral metasurface both at low temperature and room temperature. At low temperature, intrinsic optical chirality of WSe2 has been excited, associated with chiral-resonant mode in chiral metasurface shift dimer nanorods, both enhanced and reversed circular dichroism has been achieved. Although WSe2 is not a chiral gain material at room temperature, the chiral-resonant mode of metasurface is strong enough to generate circular polarized photoluminescence combining with WSe2. Our work integrate two novel system to efficiently manipulate circular polarized light emission and form a compact device due to both gain material and structures are low dimensional. The room-temperature-workable chiral emission bring this device close to practical applications such as optical information technologies and chip-scale bio-sensing.