Advent of new materials such as van der Waals heterostructures, propels newresearch directions in condensed matter physics and enables development ofnovel devices with unique functionalities. Here, we show experimentally that amonolayer of MoSe2 embedded in a charge controlled heterostructure can be usedto realize an electrically tunable atomically-thin mirror, that effects 90%extinction of an incident field that is resonant with its exciton transition.The corresponding maximum reflection coefficient of 45% is only limited by theratio of the radiative decay rate to the linewidth of exciton transition and isindependent of incident light intensity up to 400 Watts/cm2. We demonstratethat the reflectivity of the mirror can be drastically modified by applying agate voltage that modifies the monolayer charge density. Our findings couldfind applications ranging from fast programmable spatial light modulators tosuspended ultra-light mirrors for optomechanical devices.
展开▼
