Related Experiment Video
Updated: Aug 8, 2025

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
Customizing Radiative Decay Dynamics of Two-Dimensional Excitons via Position- and Polarization-Dependent
Sanghyeok Park1, Dongha Kim1, Yun-Seok Choi2
1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Abstract:
Embodying bosonic and interactive characteristics in two-dimensional space, excitons in transition metal dichalcogenides (TMDCs) have garnered considerable attention. The utilization of the strong-correlation effects, long-range transport, and valley-dependent properties requires customizing exciton decay dynamics. Vacuum-field manipulation allows radiative decay engineering without disturbing intrinsic material properties. However, conventional flat mirrors cannot customize the radiative decay landscape in TMDC's plane or support vacuum-field interference with desired spectrum and polarization properties. Here, we present a meta-mirror platform resolving the issues with more optical degrees of freedom. For neutral excitons of the monolayer MoSe2, the optical layout formed by meta-mirrors manipulated the radiative decay rate in space by 2 orders of magnitude and revealed the statistical correlation between emission intensity and spectral line width. Moreover, the anisotropic meta-mirror demonstrated polarization-dependent radiative decay control. Our platform would be promising to tailor two-dimensional distributions of lifetime, density, diffusion, and polarization of TMDC excitons in advanced opto-excitonic applications.
Related Concept Videos
Atomic Nuclei: Nuclear Relaxation Processes
IR Absorption Frequency: Delocalization
In IR...
Deactivation Processes: Jablonski Diagram
Atomic Emission Spectroscopy: Interference
Fermi Level Dynamics
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
UV–Vis Spectroscopy: Molecular Electronic Transitions

