Design, fabrication, and characterization of epsilon negative and near-zero index metasurface

Ankit,; Kishor, Kamal; Sinha, Ravindra Kumar

doi:10.1007/s00339-023-07239-z

Cited by 5 publications

(1 citation statement)

References 51 publications

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“…They are constructed from subwavelength structures known as meta-atoms or meta-molecules, which are carefully engineered to exhibit desired electromagnetic properties [1]. Metasurfaces offer a wide range of applications due to their ability to exhibit properties such as negative permeability and permittivity [2,3], tunable negative refractive index [4], and other fascinating characteristics such as perfect lenses [5], antennas [6], temperature and refractive index sensor [7] and perfect reflectors [8] etc. In many * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

SOI Based metasurface for broadband perfect reflection in visible spectrum

Ankit,

Kishor,

Sinha

2024

J. Opt.

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We propose modeling and design of a low-loss all-dielectric metasurface (DM), comprised of Silicon on Insulator (SiO2) substrate to demonstrate a perfect reflector in the visible spectrum. The proposed metasurface unit cell consists of V and W shapes arranged in a mirror image configuration, with nanometre-sized gaps (g) between them. A narrow peak with a nearly 100% reflectance and a broad perfect reflectance spectrum is observed within the visible region (400–700 nm) of the electromagnetic spectrum. The effective electromagnetic parameters were also analyzed for electric and magnetic dipole resonance. The electric and magnetic field distributions at the resonant wavelength were also analyzed for the proposed structure. By altering the gap region ‘g’, the thickness of the dielectric Silica layer (ts ), and the Si resonator (t m), the proposed structure exhibits tunable characteristics. We have successfully illustrated the consistent position of the scattering parameter’s response, regardless of the structure’s rotation, concluding the homogeneity of the designed structure across the entire visible spectrum. The all-DM exhibits a unique combination of features, including a distinct and wide reflectance spectrum as well as a tuned and enhanced electric field which makes it an ideal platform for the applications in filters, color printing, low-loss slow-light devices, and nonlinear optics.

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Section: Introductionmentioning

confidence: 99%

SOI Based metasurface for broadband perfect reflection in visible spectrum

Ankit,

Kishor,

Sinha

2024

J. Opt.

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4H‐SiC Metalens: Mitigating Thermal Drift Effect in High‐Power Laser Irradiation

Chen,

Sun,

et al. 2024

Advanced Materials

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Enhancing energy density and efficiency in laser processing hinges on precise beam focusing, yet this often causes severe heat absorption and focus shifts in optical lenses. Traditional cooling methods increase cost and complexity, severely limiting versatility. Here, monolithic silicon carbide (SiC) metalens is introduced, which shows unparalleled thermal stability, integrated with a high‐power laser. This metalens achieves diffraction‐limited focusing with a numerical aperture (NA) of 0.5 and a focal length of 1 cm. Under a 1030 nm pulsed laser at 15 W for 1 h, it shows a minimal temperature rise of 3.2 °C and a tiny focal shift of 14 µm (0.1% relative), only 6% of the shift in conventional lenses. When used to cut a 4H‐SiC substrate with the same laser, the metalens exhibit only an 11.4% change in cutting depth after 1 h of operation, correlating with the focal shift results. The results unveil a groundbreaking class of compact SiC photonics devices nearly impervious to heat absorption, representing a monumental leap for high‐power laser systems and opening new horizons for their applications and efficiency.

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Quadrupole mode plasmon resonance enabled dual-band metamaterial for refractive index sensing application

Ankit,

Baitha,

Kishor

et al. 2024

Journal of Applied Physics

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In this paper, design and fabrication of a dual-band near-zero index metamaterial (MTM) structure using copper on an epoxy resin fiber (FR-4) dielectric substrate is reported for refractive index sensing applications. The primary objective is to achieve dual-band operation spanning a 1–15 GHz frequency range, with a specific focus on achieving a broad bandwidth in the C-band. The resonance of the MTM structure was ascribed to the coupling of plane electromagnetic waves with surface plasmon polaritons on the structure, resulting in a quadrupole plasmon resonance mode. Furthermore, transmission characteristics of the fabricated MTM structure were experimentally measured and found to align closely with the simulated results obtained through the finite element method in COMSOL Multiphysics. The designed MTM structure demonstrates negative and near-zero permittivity at resonance frequencies, enabling left-handed and near-zero index behavior in dual microwave frequency bands. Under room temperature conditions, the MTM sensor exhibited sensitivities of 1 GHz/RIU and 3 GHz/RIU at resonance frequencies of 2.7 and 7.3 GHz, respectively. Consequently, the MTM structure exhibits significant potential for diverse applications, serving as a valuable component in sensors, detectors, and optoelectronic devices operating in the GHz region.

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Design, fabrication, and characterization of epsilon negative and near-zero index metasurface

Cited by 5 publications

References 51 publications

SOI Based metasurface for broadband perfect reflection in visible spectrum

SOI Based metasurface for broadband perfect reflection in visible spectrum

4H‐SiC Metalens: Mitigating Thermal Drift Effect in High‐Power Laser Irradiation

Quadrupole mode plasmon resonance enabled dual-band metamaterial for refractive index sensing application

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