4 research outputs found
Analog Computing Using Graphene-based Metalines
We introduce the new concept of "metalines" for manipulating the amplitude
and phase profile of an incident wave locally and independently. Thanks to the
highly confined graphene plasmons, a transmit-array of graphene-based metalines
is used to realize analog computing on an ultra-compact, integrable and planar
platform. By employing the general concepts of spatial Fourier transformation,
a well-designed structure of such meta-transmit-array combined with graded
index lenses can perform two mathematical operations; i.e. differentiation and
integration, with high efficiency. The presented configuration is about 60
times shorter than the recent structure proposed by Silva et al.(Science, 2014,
343, 160-163); moreover, our simulated output responses are in more agreement
with the desired analytic results. These findings may lead to remarkable
achievements in light-based plasmonic signal processors at nanoscale instead of
their bulky conventional dielectric lens-based counterparts
Line-wave waveguide engineering using Hermitian and non-Hermitian metasurfaces
Abstract Line waves (LWs) refer to confined edge modes that propagate along the interface of dual electromagnetic metasurfaces while maintaining mirror reflection symmetries. Previous research has both theoretically and experimentally investigated these waves, revealing their presence in the microwave and terahertz frequency ranges. In addition, a comprehensive exploration has been conducted on the implementation of non-Hermitian LWs by establishing the parity-time symmetry. This study introduces a cutting-edge dual-band line-wave waveguide, enabling the realization of LWs within the terahertz and infrared spectrums. Our work is centered around analyzing the functionalities of existing applications of LWs within a specific field. In addition, a novel non-Hermitian platform is proposed. We address feasible practical implementations of non-Hermitian LWs by placing a graphene-based metasurface on an epsilon-near-zero material. This study delves into the advantages of the proposed framework compared to previously examined structures, involving both analytical and numerical examinations of how these waves propagate and the underlying physical mechanisms