Near-Field Imaging of Surface Plasmons from the Bulk and Surface State of Topological Insulator Bi2Te2Se

• DOI: 10.1021/acsphotonics.9b00814
• Publication Date: 2019-09-10T00:30:01Z
• Authors: Prabhu K. Venuthu...; Xiaolei Wen; Vasudevan Iyer; Yong P. Chen; Xianfan Xu
• Keywords: Nanophotonics; Topological insulator; Localized surface plasmon

Surface plasmons are collective oscillations of electrons that can enable confinement electromagnetic energy to subwavelength scales. Recent progress in plasmonics has largely relied on noble metals which not CMOS compatible. Hence there is a need search for new plasmonic materials. Here we show the topological insulator Bi2Te2Se plasmonic, and study distinct surface arising from its bulk state. We launch propagating plasmon via nanoscale slit detect it using near-field scanning optical microscopy. observe wavelength originated state very short, more than 100 times smaller incident light wavelength, sharp contrast order wavelength. This short due two-dimensional nature state, similar graphene. The strong be exploited various applications including integrated circuits devices.