Sub-picosecond steering of ultrafast incoherent emission from semiconductor metasurfaces

Control of Quantized Spontaneous Emission from Single GaAs Quantum Dots Embedded in Huygens’ Metasurfaces

“…66−68 Second, nanopatterning of light-emitters typically reduces the effective lifetime due to the increase of surface-related defect states. 18,47,51,69 In contrast, here both dots embedded in the metasurface and in the slab (see SI) show longer lifetimes than previously reported in the literature. This indicates that the metasurface fabrication process�including the nanoscale dry etching�has not degraded the QD emission properties.…”

Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces

“…[14][15][16][17][18] So far, optical excitation provides the fastest modulation source allowing ultrafast dynamic control of nanophotonic devices. [19][20][21] Originally, the strong optical nonlinearities in plasmonic meta-atoms were first investigated as a route toward ultrafast nanophotonics. 22 Subsequently, their ohmic losses at optical frequencies and the poor compatibility with large-scale CMOS integration opened the way for the advent of all-dielectric structures, which have already been demonstrated to achieve ultrafast control of polarization, amplitude, and wavefront.…”

“…22 Subsequently, their ohmic losses at optical frequencies and the poor compatibility with large-scale CMOS integration opened the way for the advent of all-dielectric structures, which have already been demonstrated to achieve ultrafast control of polarization, amplitude, and wavefront. 21,[23][24][25][26] In all-optically modulated devices, the ultrafast two-photon absorption (TPA) and free carrier (FC) generation dynamics come along with thermal effects related to lattice heating, which take place at the nanosecond timescale. 27 Recently, it was demonstrated that by properly engineering the metasurface, it is possible to achieve a full recovery of the optical response on the picosecond timescale.…”

Unlocking Efficient Ultrafast Bound-Electron Optical Nonlinearities via Mirror Induced Quasi Bound States in the Continuum

“…Time-varying metasurfaces are powerful reconfigurable platforms to realize novel and enhanced active photonic functionalities through subwavelength control of amplitude, phase, and polarization of light. − Promising applications of such highly controllable light–matter interactions include ultrafast all-optical switching, modulation, and beam steering. − Such platforms and devices are enabled by a class of optical nonlinearities based on the intensity-dependent refractive index change . These types of ultrafast optical phenomena are classified based on the physical processes harnessed for index modulation.…”