In this talk, we will discuss our recent work in the area of wave manipulation with high-contrast metasurfaces, with special interest in manipulating optical wavefronts and thermal emission. In addition to our recent theoretical and experimental work in the area of gradient metasurfaces to manipulate the impinging light, we will discuss how similar concepts may be extended to thermal sources, to manipulate their emission features. Incandescent sources made of electrically-heated films suffer from low efficiencies and offer poor control over the directionality and spatial localization, as well as the spectral and polarization properties of the emitted light. We have recently demonstrated that, by nanostructuring a SiC surface, we can concentrate the thermal emission of a preselected spectral range into a well-defined location above the surface. Concentrating the thermal radiation can have direct impact on the design and operation of the future generation of thermo-photovoltaic cells in addition to providing the ability for local heat generation and moreover mitigate challenges associated with thermal management in low thermal budget devices. Our recent theoretical work suggests that gradient metasurface concepts may be suitably extended to tailor thermal emission control with a new degree of control.
The interaction of quantum radiation and a two-level atom is described in the context through the Jaynes-Cummings-Paul Hamiltonian which is obtained through Heisenberg's interaction picture of the Atom-Radiation Hamiltonian. We
argue that such a transformation is not mathematically exact in case of ultrastrong coupling, where the coupling rate is
comparable to the transition frequency, and leads to erroneous results. In addition, we introduce an exact mathematical
solution to calculate optical spectrum of this system.
A theory is presented for the quantum radiation emitted from a single exciton in a quantum dot. We assume that the
quantum dot is in strong coupling to a slab photonic crystal cavity. A dielectric function of spatial coordinates is used to
explain the effects of the macroscopic medium. It has been proved that the electric field in such a medium can be
described using the so-called K-function. We derive a formula for obtaining the frequency spectrum, and present an
analytical result for the optical spectrum, which is dependent on the K-function. We also have considered a slab photonic
crystal configuration with hexagonal structure containing a cavity to evaluate the frequency spectrum in such a medium.
FDTD method has been used to calculate the generalized-transverse green function and the K-function everywhere in the
medium.
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