Abstract
We propose to use double negative (DNG) metamaterial slabs to build effective super-absorbers and perfect nanodetectors for single divergent sources. We demonstrate by numerical simulations that an absorbing nanoparticle properly placed inside a DNG slab back-covered with a perfect electric conductor or perfect magnetic conductor mirror can absorb up to 100% radiation energy of a single dipole source placed outside the slab. Furthermore, we also show that even the simple DNG slab without any absorbing nanoparticle could be used as a perfect absorber for both plane and divergent beams. The proposed systems may focus the radiation in nanoscale and thus have applications in optical nanodevices for a variety of different purposes.
Highlights
A novel concept of coherent perfect absorbers (CPAs) [1,2] has recently been proposed and demonstrated experimentally by the example of asymmetric Fabry-Perot cavity with small losses which was symmetrically irradiated by 2 coherent plane waves
All the energy of incoming plane waves is fully absorbed by the dielectric slab, and the radiation from the system disappears for certain parameters
Since the control of radiation of atoms and molecules with nanoparticles and metamaterialsis an important topic today, it is desirable to have an effective nanoabsorber or nanodetector of electromagnetic fields from a single atom or molecule. Based on both analytical dipole model analyses and numerical simulations, we have recently proposed a coherent perfect nanoabsorber (CPNA) for 2 divergent beams [6] using a slab made of double negative (DNG) metamaterial with negative refraction [7]
Summary
A novel concept of coherent perfect absorbers (CPAs) [1,2] has recently been proposed and demonstrated experimentally by the example of asymmetric Fabry-Perot cavity with small losses which was symmetrically irradiated by 2 coherent plane waves. Since the control of radiation of atoms and molecules with nanoparticles and metamaterialsis an important topic today, it is desirable to have an effective nanoabsorber or nanodetector of electromagnetic fields from a single atom or molecule Based on both analytical dipole model analyses and numerical simulations, we have recently proposed a coherent perfect nanoabsorber (CPNA) for 2 divergent beams [6] using a slab made of double negative (DNG) metamaterial with negative refraction [7]. This device would allow absorbing all the energy from the 2 point dipole sources emitted in the direction towards the negative refraction slab by a lossy nanoparticle placed inside it.
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