Prof. Mustafa Eginligil Profile

Prof. Mustafa Eginligil

at Nanjing Univ of Technology

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Proceedings Article | 20 August 2020 Presentation

Giant circular photogalvanic effect in topological insulator metamaterials

Xinxing Sun, Giorgio Adamo, Harish N. Krishnamoorthy, Mustafa Eginligil, Nikolay Zheludev, Cesare Soci

Proceedings Volume 11460, 114600D (2020) https://doi.org/10.1117/12.2571304

KEYWORDS: Dielectrics, Metamaterials

Read Abstract +

Despite being very weak, the chiral optical response of natural media plays a fundamental role in several areas of photonics, medicine, pharmacology, and quantum optics. Topological insulators are a class of materials in which spin-momentum locking induces a preferential response of surface electrons to circularly polarized light. However, the resulting spin-polarized photocurrents are often hindered by the strong contribution of bulk electrons. Here we show that the intrinsic circular photogalvanic effect in topological insulator BSTS (Bi_1.5Sb_0.5Te_1.8Se^1.2), probed by helicity dependent photocurrent, can be enhanced by one order of magnitude when a non-chiral metamaterial design is patterned on the crystal surface. This method can be adopted to control the polarization properties of Dirac materials beyond topological insulators by metamaterial design, opening up new opportunities for the detection of quantum light, molecular sensing, and the realization of opto-spintronic devices.

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