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Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction
Light propagation can be controlled with plasmonic interfaces that introduce abrupt phase shifts along the optical path. Conventional optical components rely on gradual phase shifts accumulated…
Quantum Cascade Laser
A semiconductor injection laser that differs in a fundamental way from diode lasers has been demonstrated. It is built out of quantum semiconductor structures that were grown by molecular beam…
Flat optics with designer metasurfaces.
This Review focuses on recent developments on flat, ultrathin optical components dubbed 'metasurfaces' that produce abrupt changes over the scale of the free-space wavelength in the phase, amplitude and/or polarization of a light beam.
Aberration-free ultrathin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces.
The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced…
Nanometre optical coatings based on strong interference effects in highly absorbing media.
It is shown that under appropriate conditions interference can instead persist in ultrathin, highly absorbing films of a few to tens of nanometres in thickness, and a new type of optical coating comprising such a film on a metallic substrate, which selectively absorbs various frequency ranges of the incident light is demonstrated.
Polarization-Controlled Tunable Directional Coupling of Surface Plasmon Polaritons
Plasmonic couplers that overcome limits in the polarization sensitivity of the coupling efficiency and in controlling the directionality of the SPPs are designed and demonstrated using polarization-sensitive apertures in a gold film.
Multimode regimes in quantum cascade lasers: From coherent instabilities to spatial hole burning
A theoretical and experimental study of multimode operation regimes in quantum cascade lasers QCLs is presented. It is shown that the fast gain recovery of QCLs promotes two multimode regimes: One is…
Recent progress in quantum cascade lasers and applications
Quantum cascade (`QC') lasers are reviewed. These are semiconductor injection lasers based on intersubband transitions in a multiple-quantum-well (QW) heterostructure, designed by means of…
Quantum Mechanical Actuation of Microelectromechanical Systems by the Casimir Force
This work demonstrates the Casimir effect in microelectromechanical systems using a micromachined torsional device and shows that quantum electrodynamical effects play a significant role when the separation between components is in the nanometer range.
Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging
The results firmly establish that metalenses can have widespread applications in laser-based microscopy, imaging, and spectroscopy, with image qualities comparable to a state-of-the-art commercial objective.