Experimental observation of diffractive retroreflection from a dielectric metasurface

Kupriianov, Anton S.; Khardikov, Vyacheslav V.; Domina, Kateryna L.; Prosvirnin, S. L.; Han, Wei; Tuz, Vladimir R.

doi:10.1063/5.0145338

Cited by 4 publications

(1 citation statement)

References 54 publications

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“…The experimental data reveal how the near field affects the quantum mechanics system. Near field measurement techniques are well known in the microwave range [32,33] but poorly developed in the optical range. The methodology presented in this article is intended to fill the existing gap.…”

Section: Discussionmentioning

confidence: 99%

Permittivity Model Selection Based on Size and Quantum-Size Effects in Gold Films

Riabenko,

Shulga,

Makarovskii

et al. 2023

East Eur. J. Phys.

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The article is focused on optical properties of nanostructures containing spherical gold nanoparticles of various radii. We explore correlation between the particle radius and the choice of permittivity model applied to describe optical absorption spectra of gold granules. The experiments show splitting of the absorption band of granular gold films to form a second absorption peak. The first peak is associated with the phenomenon of plasmon resonance, while the second one reflects quantum hybridization of energy levels in gold. Quantum effects are shown to prevail over size effects at a granule diameter of about 5-6 nm. The Mie theory gives a rigorous solution for the scattered electromagnetic field on a sphere taking into account optical properties of the latter, however, it does not specify the criteria for selecting a model to calculate dielectric permittivity. Both calculations and experiments confirm the limiting diameter of gold nanoparticles where the Hampe-Shklyarevsky model is applied. Meanwhile, this model is still unable to predict the splitting of the plasma absorption band. The data presented in the article can be used for a predetermined local field enhancement in composite media consisting of a biolayer and metal nanoparticles. The conducted research provides a deeper understanding of the influence of a terahertz high-intensity electromagnetic field localized in the space on quantum dots.

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Section: Discussionmentioning

confidence: 99%

Permittivity Model Selection Based on Size and Quantum-Size Effects in Gold Films

Riabenko,

Shulga,

Makarovskii

et al. 2023

East Eur. J. Phys.

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Stable vortex waves generation by a flexible antenna made of highly conductive graphene film

He,

Gu,

Tuz

et al. 2023

Applied Physics Letters

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Electromagnetic waves carrying orbital angular momentum (OAM and vortex waves) attract much attention due to their specific characteristics and prospects for use in wireless communication, biomedical engineering, and imaging. Vortex waves are complex spatial entities; therefore, their stable generation is a quite complicated task, especially in the radio frequency and terahertz wave domains, considering that the corresponding antennas must be precisely adjusted. Such adjusting is very difficult to achieve for flexible antennas, which are now being actively introduced into practice. Here, we propose a design of a flexible antenna that is able to stably generate waves carrying OAM even when being subjected to some bending. The antenna is composed of a ring-shaped resonator made of a highly conductive graphene film deposited on a thin polydimethylsiloxane substrate. The antenna is operated on two mutually orthogonal degenerate TMm1 modes excited by two supply strip lines to generate vortex waves with a desired topological charge. We verify this ability numerically and in a microwave experiment on two antenna prototypes deriving the OAM mode purity by changing the bending radius of the antenna bearing surface, giving it either positive or negative curvature. The obtained experimental results confirm that the antenna has good performance and can be used for flexible electronic devices and communication systems.

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Experimental validation of group delay in a multi-window electromagnetically induced transparency metasurface

Chen,

Breslavets,

Savin

et al. 2024

Journal of Applied Physics

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Metasurface analogs of electromagnetically induced transparency (EIT) are attracting sustaining attention due to their ability to maintain transparency windows accompanied by extreme dispersion of propagating waves, which are important for slow light devices and highly sensitive optical sensors. In this paper, we study theoretically, numerically, and experimentally the conditions for the existence of multi-band transparency windows in the metasurface supported by the interaction of dipole modes in an asymmetric unit cell. The unit cell is composed of a single bright resonator and several dark resonators made in the form of rectangular metal patches. The manifestation of EIT is studied for different metasurface configurations by varying the number and positions of resonators used within the unit cell. To validate the slow-down effect caused by EIT, a prototype of the metasurface is fabricated and tested, providing a measurement of the group delay and bandwidth-delay product features. The obtained results clearly confirm the presence of four EIT-like transparency windows in the metasurface transmission spectra originating from the coupling between either quasi-TE or quasi-TM modes of the resonators.

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Experimental observation of diffractive retroreflection from a dielectric metasurface

Cited by 4 publications

References 54 publications

Permittivity Model Selection Based on Size and Quantum-Size Effects in Gold Films

Permittivity Model Selection Based on Size and Quantum-Size Effects in Gold Films

Stable vortex waves generation by a flexible antenna made of highly conductive graphene film

Experimental validation of group delay in a multi-window electromagnetically induced transparency metasurface

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