Enhancing Absorption Bandwidth through Vertically Oriented Metamaterials

Abstract

Metamaterials research has developed perfect absorbers from microwave to optical frequencies, mainly featuring planar metamaterials, also referred to as metasurfaces. In this study, we investigated vertically oriented metamaterials, which make use of the entire three-dimensional space, as a new avenue to widen the spectral absorption band in the infrared regime between 20 and 40 THz. Vertically oriented metamaterials, such as those simulated in this work, can be experimentally realized through membrane projection lithography, which allows a single unit cell to be decorated with multiple resonators by exploiting the vertical dimension. In particular, we analyzed the cases of a unit cell containing a single vertical split-ring resonator (VSRR), a single planar split-ring resonator (PSRR), and both a VSRR and PSRR to explore intra-cell coupling between resonators. We show that the additional degrees of freedom enabled by placing multiple resonators in a unit cell lead to novel ways of achieving omnidirectional super absorption. Our results provide an innovative approach for controlling and designing engineered nanostructures.

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

“…They are composed of a series of subwavelength elements that can be 3D printed by metal or thermoplastic, milled and cutted [8,9], making their fabrication relatively simple and inexpensive. Metasurfaces have numerous applications, such as flat-focusing lenses [7,10], frequency-selective filters [11], reflectors [12], polarizers [13], and broadband absorbers [14].…”

A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies

“…They are composed of a series of subwavelength elements that can be 3D printed using metal or thermoplastic, milled, and cut [8,9], making their fabrication relatively simple and inexpensive. Metasurfaces have numerous applications, such as for flat-focusing lenses [7,10], frequency-selective filters [11], reflectors [12], polarizers [13], and broadband absorbers [14].…”

Coherent perfect absorption in epsilon-near-zero ITO thin film in near infrared

“…Usually ENZ properties are to search in periodic 2D and 3D metamatrials (MMs) at the NIR, IR or microwave regimes. It is not rare to extract this property even in visible and infrared region in theoretical and experimental approaches of MMs [3][4][5][6]. These nanostructured ENZ MMs are being used in tunneling the electric field and for the transformation of the wavefront with small phase variation [7][8][9][10][11][12][13][14] or in optical cloaking [15].…”