A Triple Band Polarization Insensitive Ultrathin Metamaterial Absorber for S- C- And X-Bands

Abstract

In this paper, design of a triple band ultrathin compact polarization insensitive metamaterial absorber for S-, C-and X-band applications is proposed. The proposed absorber consists of periodic arrangement of a modified triple circular slot ring resonator as unit cell printed on the top of a continuous metal backed FR-4 dielectric substrate. The proposed absorber is ultrathin having thickness of λ 0 /135.66 at the lowest absorption center frequency. The measured wide stable absorption bands of 0.40 GHz, 0.45 GHz and 0.47 GHz with absorption peaks of 97%, 96.45% and 98.20% at absorption center frequencies of 2.90 GHz, 4.18 GHz and 9.25 GHz respectively are observed. The temperature profile of absorber is measured by using lock in infrared thermography, and a temperature increase of 1 • C at absorbing frequency as compared to non-absorbing frequency is observed. The absorber is demonstrated to be polarization insensitive to TE and TM polarized angles of incidence of electromagnetic wave with wide angular stability up to 45 •. The absorber is fabricated and tested in an anechoic chamber. Experimental results agree well with measured ones.

Control of fluorescence in quantum emitter and metallic nanoshell hybrids for medical applications

“…Our theory is valid for any dielectric material used as core or spacer layer for the fabrication of DNS such as Silica, Y 2 O 3 and YPO 4 . The effect of these materials in our theory is represented by their corresponding dielectric constants (i.e.…”

“…We can also calculate the polarizability for the spherically shaped DNS from eqns. (1)(2)(3)(4)(5). We consider that the radii of the core, metallic shell and DNS are denoted as , and , respectively.…”

“…Noble-metal nanoparticles are known to enhance emission rates of quantum emitters (QEs) significantly by decreasing their radiative lifetime and increasing their quantum yield [1][2][3][4][5][6][7]. The enhancement of the emission in QEs such as molecular fluorophores is a highly useful strategy for improving detection sensitivity and selectivity in many emerging applications, including DNA screening [5], single molecule detection [6] and image enhancement [7].…”

Angle of Incidence and Polarization Insensitive Ultra-Thin Ultra Wide-Band Metamaterial Absorber based on Novel Non-Linearity in Unit Cell Design

“…Combination of periodic array of split ring resonators and micro-structured thin wires was suggested and implemented to design metamaterials [3]- [5]. In recent years, the research in MMs have significantly increased due to their ability to create artificial electromagnetic responses with promising implementations such as perfect lens [6], [7] in devices with negative refractive index, cloaking [8] in devices for hiding objects, MM based compact patch antennas [9] in radiating devices, MM based THz waveguide [10] and Angle of Incidence and Polarization Insensitive Ultra-Thin Ultra Wide-Band Metamaterial Absorber based on Novel Non-Linearity in Unit Cell Design metamaterial absorbers (MMAs) [11]- [24] in absorbing devices. The recent research trends for MM based microwave absorbers exhibit nearly unity absorption [11], millimeter scale dimensions, single to multiband absorptance peaks [11]- [24], insensitive to polarization angle and wide angle of incidence [17]- [21] found applications in photo-detectors [25], wireless LAN [26], micro-electronic photonic circuits [27], MM spectroscopy and imaging [28].…”

Analysis of Conformal Quad Band Metamaterial Absorber Design on Planar and Cylindrical Surface

“…Landy et al in 2008 [6] designed and experimentally verified the first metamaterial absorber at 11.48 GHz with an absorption rate of 96% and bandwidth of 4%. Subsequently, dual band [7,8], tripleband [9,10], quadband [11][12][13][14][15], multiband [16], and wideband [17] absorbers have been developed. Later on, conformal multiband absorbers have also been reported [12,18,19].…”