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A scheme for generating intense single-cycle pulses in the 5–14 μm wavelength range is proposed. The generation mechanism is described by photon frequency downshifting of an off-the-shelf Ti:sapphire laser in a tailored plasma density structure.
Previous predictions that light radiated by modes around a bound state in the continuum (BIC) condition should exhibit a vortex in the far-field polarization profile are experimentally confirmed. The findings shed light on the origin of BICs.
While modifications of emission and absorption rates are commonplace in photonics, similar manipulations of emitter transition frequencies are challenging. Here, 2D polaritons in graphene are predicted to enable non-vertical electronic transitions in a quantum well, controlling the transition frequencies by inducing an effective non-locality.
Eigenmodes of photonic crystal defects have now been topologically protected in an experimental demonstration that also shows how to minimize the mode volume.
Progress in silicon photonics is delivering chips that can densely pack photonics and electronics together and perform multidimensional quantum information processing.
The electromagnetic instability associated with a dense, ultra-relativistic electron beam propagating in a thin conductor could offer a new approach to realizing ultra-bright sources of gamma-rays.
Third-harmonic generation and four-wave mixing of light can be enhanced in graphene with gate tuning to adjust the doping level. The findings may lead to new graphene-based nonlinear optoelectronic devices.
