A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector
Fucheng Qiu, Guanjun You, Zhiyong Tan, Wenjian Wan, Chang Wang, Xiao Liu, Xinzhong Chen, Rui Liu, Hu Tao, Zhanglong Fu, Hua Li, Juncheng Cao Juncheng Cao
Abstract
and a spectral response range from 2 to 7 THz. The fast-responding capability of the THz QWP is vital for detecting the rapidly tip-modulated THz light which can effectively suppress the background noise. The THz images of the nanostructure demonstrate a spatial resolution of about 95 nm, corresponding to ∼λ/752 at 4.2 THz. We experimentally investigate and theoretically interpret the formation of the fringes which appear at the edge position of a gold stripe in the THz near-field image.
Topics & Concepts
Terahertz radiationOpticsPhotodetectorOptoelectronicsLaserQuantum cascade laserMaterials sciencePhysicsPlasmonic and Surface Plasmon ResearchNear-Field Optical MicroscopyPhotonic and Optical Devices