TY - JOUR

T1 - Efficient Anomalous Refraction of THz Beams with a Multilayer Metal-Polymer Huygens' Metasurface

AU - Kuznetsov, Sergei

AU - Tumashov, Maksim

AU - Killamsetty, Vinay K.

AU - Lazorskiy, Pavel

AU - Epstein, Ariel

AU - Glybovski, Stanislav

N1 - Russian Science Foundation (Grant Number: 19-79-10260)

PY - 2023

Y1 - 2023

N2 - We describe design principles, fabrication techniques, and experimental testing for a Huygens' metasurface which deflects a normally incident radiation beam at $f\approx 0.172$ THz towards an angle of 52$^\circ$ in transmission. The metasurface is comprised of a cascade of five spatially-modulated aluminum impedance sheets photolithographically patterned on 100-$\mu$m-thick polypropylene substrates, stacked together via ultrathin adhesive layers. The physical geometries realizing the five-layer Huygens' meta-atoms are designed using a semi-analytical model, while the expected deflection, associated with negligible reflection and low diffractive losses, is verified by full-wave simulations and measurements. For the implemented deflector, with a working aperture diameter of 75 mm, the experimentally measured refraction efficiency reached 58%, with 20% and 22% losses attributed to spurious diffraction and absorption, respectively. Despite the suboptimal performance, our results establish the proposed methods of synthesis and fabrication as promising for realizing quasi-optical THz components with unique characteristics, unattainable at this challenging regime with alternative approaches.

AB - We describe design principles, fabrication techniques, and experimental testing for a Huygens' metasurface which deflects a normally incident radiation beam at $f\approx 0.172$ THz towards an angle of 52$^\circ$ in transmission. The metasurface is comprised of a cascade of five spatially-modulated aluminum impedance sheets photolithographically patterned on 100-$\mu$m-thick polypropylene substrates, stacked together via ultrathin adhesive layers. The physical geometries realizing the five-layer Huygens' meta-atoms are designed using a semi-analytical model, while the expected deflection, associated with negligible reflection and low diffractive losses, is verified by full-wave simulations and measurements. For the implemented deflector, with a working aperture diameter of 75 mm, the experimentally measured refraction efficiency reached 58%, with 20% and 22% losses attributed to spurious diffraction and absorption, respectively. Despite the suboptimal performance, our results establish the proposed methods of synthesis and fabrication as promising for realizing quasi-optical THz components with unique characteristics, unattainable at this challenging regime with alternative approaches.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85177066015&origin=inward&txGid=1ec2fa61c208d5ac24846d1955253d12

UR - https://www.mendeley.com/catalogue/b34a3617-53e9-301c-b0a1-70995b2a9679/

U2 - 10.1109/tthz.2023.3332302

DO - 10.1109/tthz.2023.3332302

M3 - Article

SP - 1

EP - 13

JO - IEEE Transactions on Terahertz Science and Technology

JF - IEEE Transactions on Terahertz Science and Technology

SN - 2156-342X

ER -