Broadband and wide-angle terahertz carpet cloaks based on pattered graphene metasurfaces

Abstract

Conventional metasurface carpet cloak generally has a narrow working bandwidth and a small incident angle range, which is far from meeting the requirements of modern military for broadband and wide-angle cloaking. Based on graphene apertures and graphene patches, we propose the design of metasurface carpet cloaks for terahertz wave and explore their application potential in realizing broadband and wide-angle cloaking. Simulation results demonstrate that the carpet cloaks based on graphene apertures and patches can achieve a large working bandwidth of 35.7% and 52.6%, and a wide angular span of ±30° and ±40°, respectively. The cloaking performance and the working bandwidths of the two graphene metasurface carpet cloaks can be tuned by changing the graphene Fermi energy uniformly. The carpet cloak constructed by graphene patches has a larger bandwidth and a wider angle domain than that by graphene apertures, which can be understood by comparing the phase dispersion of the two graphene metasurfaces.

Recent progresses on metamaterials for optical absorption and sensing: a review

“…Furthermore, due to the high electric mobility and tunable conductivity, 2D materials based MMAs have strong tunability by tuning electrostatic voltage [144][145][146][147][148][149]. Specially, significant efforts have been focused on fabricating MMAs based on graphene in the past years [150][151][152][153][154][155][156][157]. Xiong et al presented a dynamically tunable MM graphene absorber (MGA) composed of metal wire and graphene sheet in terahertz regime [158].…”

Anapole Manipulation in Tailored Si Nanocubes for Near-Field Enhancement and High Q-Factor Resonance

“…2,3 The hot spots of the electromagnetic field generated by metal metamaterials are localized at structure tips, troughs, gaps, and other positions, which have strong electromagnetic field enhancement and nonlinear enhancement ability. 4,5 The design of various plasmonic metamaterials has led to a series of revolutionary breakthroughs in different fields, such as labelfree biosensing, 6 refractive index sensing, 7−9 surface-enhanced Raman scattering (SERS), 10,11 perfect light absorption, 12,13 cloaks, 14 radiative cooling, 15 pinning effects, 16 photocatalysis, 17,18 and nanolasers. 19,20 However, the high intrinsic absorption, radiation losses, and associated local heating of plasmonic nanostructures severely limit their practical applications in many scenarios.…”

“…Metamaterials are materials that are typically engineered with artificial structures to produce electromagnetic properties that are unusual or difficult to obtain in nature . Metallic metamaterials that feature a multitude of localized and propagating surface plasmon modes have received considerable attention over the past few decades due to their unprecedented ability to concentrate light into subwavelength volumes. , The hot spots of the electromagnetic field generated by metal metamaterials are localized at structure tips, troughs, gaps, and other positions, which have strong electromagnetic field enhancement and nonlinear enhancement ability. , The design of various plasmonic metamaterials has led to a series of revolutionary breakthroughs in different fields, such as label-free biosensing, refractive index sensing, − surface-enhanced Raman scattering (SERS), , perfect light absorption, , cloaks, radiative cooling, pinning effects, photocatalysis, , and nanolasers. , However, the high intrinsic absorption, radiation losses, and associated local heating of plasmonic nanostructures severely limit their practical applications in many scenarios. Compared to plasmonic metamaterials, the optical response of high-index dielectric materials exhibits negligible dissipative losses, high heat resistance, and strong electromagnetic multipolar resonances in the operating wavelength. − Electromagnetic fields can be localized inside the dielectric, which strongly enhances the interaction between light and matter .…”

Multilayer graphene-based radiation modulator for adaptive infrared camouflage with thermal management

“…Graphene, with electrostatically tunable plasmonic properties in the IR to terahertz frequency range, is an ideal material for constructing tunable or reconfigurable metasurfaces and has great application potential for cloaking, camouflage and illusion [36,37]. Recently, multilayer graphene (MLG) film has proven to be an excellent dynamic thermal emissivity material with extreme flexibility and controllability [6-9, 38, 39], whose capability of efficient and fast electrical control of electromagnetic radiation can be achieved in a very broad spectral range from visible to microwave frequencies.…”