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In past few years, while lead halide perovskite micro-lasers have been thoroughly studied, their performances at high excitation power have rarely explored. Here, we study the perovskite micro-lasers with high pumping density and explore the mechanism to improve their laser characteristics. By transferring a CH3NH3PbBr3 perovskite micro-rod onto a few-layered graphene slice, whispering gallery like...
When my children asked me why I dedicated more than 25 years on THz wave related research and development, I replied that my choices were limited during the early 80s'. However, when I think back and review the development of broadband THz wave science and technology, I am delighted and very grateful for having had the opportunity, together with many colleagues, students, scientists, engineers, and...
Laser-induced plasmas with longitudinal size smaller than 40 μm are investigated as a source of broadband terahertz (THz) radiation. The angular dependent emission of the micro-plasma is measured with coherent detection, and the preferential directions of radiation are identified. The observations support electrons drift driven by the laser ponderomotive force as the principal generation mechanism...
We demonstrated broadband terahertz (THz) wave emission from thin metal (gold) films excited by two-color laser fields synthesized by an in-line phase compensator. By driving the electrons in thin metal films asymmetrically, THz wave emission is observed at normal incidence of the two-color pump beams in a transmission geometry. Similar to the air-plasma THz source excited by two-color laser fields,...
We demonstrate enhancement of transmission coefficient in InAs due to THz field induced competition where intervalley scattering overcomes impact ionization. The controllable delay of THz pulse due to sample's increased refractive index is observed.
By “seeing” the fluorescence or “hearing” the sound emitted by plasma, coherent detection of broadband THz waves by laser-induced plasma at standoff distance is feasible. We will report these recent developments in THz wave sensing with air-plasma photonics.
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