The spectral characteristics of nanostructured hyperbolic metamaterial (HMM)-based absorber is investigated. HMM structure comprised periodically arranged assembly gold nanostrips. results indicate nearly perfect absorption by the in entire ultraviolet (UV) regime electromagnetic spectrum under certain configuration - feature which would be useful for UV-shield related applications. absorptivity can tailored altering slant angle and thickness nanostrips (in structure). effect incidence light...

Abstract Achieving the broadband response of metamaterial absorbers has been quite challenging due to inherent bandwidth limitations. Herein, investigation was made a unique kind visible light absorber comprising elliptical rings-shaped fractal metasurface using tungsten metal. It found that proposed exhibits average absorption over 90% in wavelength span 400–750 nm. The features perfect could be observed because localized surface plasmon resonance causes impedance matching. Moreover,...

A specially designed metallic E-shaped fractal-based perfect metamaterial absorber (PMA) with fairly wideband absorptivity in the K- and Ka-bands of microwave regime was investigated. The PMA top surface is comprised square-shaped split-ring resonators (SRRs) surrounded stated fractal design. analyzed range 20 - 30 GHz for normal oblique incidence waves. Both transverse electric (TE) magnetic (TM) modes were taken up to observe robustness proposed It observed that exhibit capacitive effect...

An ultrathin broadband metasurface-based absorber, comprised of tungsten nanowires, was studied under the normal and oblique incidence transverse electric (TE) magnetic (TM) waves. The effect geometrical parameters on absorption spectra investigated through surface field power patterns at certain operating wavelengths. structure found to exhibit nearly perfect in ultraviolet (UV) span ~350–400 nm ~85% absorptivity visible spectral range ~400–750 nm. attempt also made validate simulation...

Abstract Hyperbolic metamaterials (HMMs) are used to demonstrate extreme sensitivity biosensing by exciting their high‐ k modes. However, momentum couplers, such as subwavelength diffraction grating or bulky high‐index prism, required excite these nonradiative modes, which is not cost‐effective and thus suitable for point‐of‐care applications. Here, a scalable HMM‐based sensor platform proposed experimentally demonstrated, the Brewster mode of HMM from free‐space. The excitation modes shown...

A specially designed tunable hyperbolic metamaterial (HMM) based on plasmon induced transparency (PIT) of fractal in the near-infrared (NIR) regime was proposed. The HMM-layer constitutes top metasurface, which is comprised fractal-like nanospheres silver (Ag) metal. bilayer graphene sandwiched between HMM and bottom silicon (Si) substrate. permittivity deduced corresponding to different chemical potentials (of graphene). PIT proposed structure obtained 3000-4000 nm wavelength band by...

A specially designed fractal metasurface-based structure was investigated as a dual-polarization converter operating in the terahertz (THz) band. The proposed has ability to perform both linear-to-cross (LX) and linear-to-circular (LC) polarization conversions. In former kind of operation, it exhibits three unity conversion ratio (PCR) peaks at 1.10 THz, 2.13 THz 3.46 frequencies, whereas latter situation, achieved over bands, namely 1.2–1.83 2.52–3.10 3.78–3.90 THz. effect oblique incidence...

Study was made of a hyperbolic metamaterial (HMM)-based optical biosensor in view possible usage to detect early-stage cancerous cells. The effective medium theory used determine the constitutive properties metasurface. reflectance obtained under different conditions observe shifts spectral minima, thereby determining status measurand. sensitivity and figure-of-merit (FoM) structure were evaluated. Observations revealed device showing relatively high FoM, which depends on thickness HMM...

Displacement sensing with subnanometer precision is a crucial technology across various fields. There pressing need for rapid, compact, long-range, and highly accurate lateral displacement measurement method that does not rely on postprocessing algorithms. In this study, we demonstrate nanoruler based confocal micrometalens arrays (MMLAs) two-dimensional (2D) transverse metrology. We have developed an 'optical scale' by constructing blazed grating tunable blaze angle proportional to the...

This letter reports a new type of plasmonic metamaterial-based comb filter with the metasurface as similar to Salusbury window, and comprised three layers - sub-wavelength-sized periodic gold nanorods surrounded by free-space (i.e., metasurface), silicon, silver nanolayers. The structure yields multiple absorption peaks upon impinged electromagnetic waves. behaves certain spectral frequencies are absorbed remaining ones reflected back. performance is analyzed in UV, visible, near infrared...

A hyperbolic metamaterial (HMM)-based absorber, comprised of metasurface having periodically arranged titanium (Ti) nanospheres, was investigated. The wavelength-dependent permittivity and absorptivity structure were evaluated considering different volume fractions Ti metal. Also, both the transverse electric (TE) magnetic (TM) incidence polarizations considered along with values angle. Using finite difference time domain (FDTD) simulation technique, absorber found to exhibit high absorption...

Investigation was made of the optical response metal-dielectric stacks-based cavity structures embedded with graphene microheaters for purpose perfect absorption. The absorber configuration exploits Ge2Sb2Te5 (GST) phase changing medium, and effects different parametric operational conditions on absorption spectra were explored. refractive indices GST layers can be manipulated by external electrical pulses applied to microheaters. amplitude duration define crystallinity ratio used mediums....

The paper demonstrates the utilization of a tunable band-pass filter in producing multi-wavelength Brillouin-erbium fiber lasers within Fabry-Perot cavity. optimization Brillouin pump wavelength position bandwidth self-lasing cavity modes is important to achieve maximum stable output channels. same number 14 channels with constant channel spacing 10.5 GHz were able be generated 32 nm range. Besides tunability, this design also has advantage consistent power requirement both 980 laser diode...

The design of broadband metamaterial perfect absorber (MPA) is proposed that operates in the ultraviolet and visible regions electromagnetic spectrum. MPA structure nanoscale size comprised three layers – U-shaped resonators (made gold) subwavelength are embedded over a nanolayer dielectric medium (silica glass), which backed by copper surface. It found yields absorption peaks with absorptivity 99% aforesaid spectral range corresponding to both transverse electric magnetic polarizations...

A specially designed vanadium dioxide (VO2) metasurface-based temperature sensor was investigated. In the configuration, stacked silicon and aluminum oxide multilayered structures were used, wherein top metasurface has sub-wavelength-sized periodically arranged VO2 nanodiscs (in form of an array), bottom silver layer acts as a perfect reflector. Spectral characteristics sensitivity structure observed under varying temperatures. Apart from these, effects nanodisc radius, thickness...

The plasmon-induced transparency (PIT) in planar metasurface comprising of resonators having one S-shaped structure and a rectangular strip (both made silver) was investigated. It found that the component induces single bright mode, whereas manifests two modes with strong coupling incidence electromagnetic waves. When both components were placed proximity, PIT-like phenomenon observed. effects rotational angle as well on transmission spectra (of metasurface) also Both transverse electric...

A programmable phase-change medium-based hyperbolic metamaterial with tunable perfect absorption in the visible and near-infrared regimes was investigated. The stochastic particle swarm optimization used design process, followed by transfer matrix method to further investigate angle-invariant polarization-insensitive spectral properties. Absorption <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>&gt;</mml:mo> </mml:mrow>...

The near-field radiative heat transfer (NFRHT) between one-dimensional metamaterials comprised of phonon dielectric multilayers was investigated experimentally. Large-size (1 \ifmmode\times\else\texttimes\fi{} 1 ${\mathrm{cm}}^{2}$) samples were fabricated using $\mathrm{Si}\mathrm{C}$, ${\mathrm{Si}\mathrm{O}}_{2}$, and $\mathrm{Ge}$ layers at a certain gap distance, the effects layer-stacking order phonon-resonance quality on NFRHT examined. measured results show good agreement with...

Abstract Heat shuttling phenomenon is characterized by the presence of a non-zero heat flow between two bodies without net thermal bias on average. It was initially predicted in context nonlinear conduction within atomic lattices coupled to time-oscillating thermostats. Recent theoretical works revealed an analog this effect for exchanges mediated photons solids having temperature dependent emissivity. In paper, we present experimental proof using systems made with composite materials based...

The absorption characteristics of complex medium structures having metasurfaces comprised columnar nanorods gold were investigated. In this stream, a periodically arranged assembly vertical circular and elliptical cross sections, backed by chromium the same cross-sectional size shape, was considered to be metasurface, comparative features emphasized. results exhibit very high corresponding certain wavelengths in visible span, absorber yields better performance than one with terms...