Dicke superradiance is a landmark of quantum optics. It enables a group of N emitters to interact both collectively and coherently. However, a strict limitation is the separation between the emitters that should be smaller than the wavelength of light restricting its applicability. This limitation can be alleviated using near-zero refractive index materials due to the large wavelength and spatial coherence. We theoretically and numerically demonstrate enhanced extended superradiance using a near-zero metamaterial designs. Ultra-high superradiant decay rate enhancement over distances greater than 13 times the free-space wavelength for both two emitters and many-body configurations of emitters is predicted.
Electromagnetic momentum inside a material is notion quite subtle to define, related to the Abraham-Minkowski debate. With new class of metamaterials emerging, allowing for extreme electromagnetic parameters such as near-zero refractive index materials or time-varying materials, those subtilties should treated with great care. Here, we revise fundamental radiative processes, momentum transfer experiments, diffraction, Doppler shift, Heisenberg inequality and microscopy applications inside near-zero refractive index. Furthermore, we demonstrate that the Minkowski momentum -related to spatial translation - is a conserved quantity inside time-varying media by three independent approaches. However, we stress how the Abraham momentum – related to energy transport – is not a conserved quantity in time-varying media.
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