A5059070232- Metamaterials and Metasurfaces Applications
- Terahertz technology and applications
- Plasmonic and Surface Plasmon Research
- Advanced Antenna and Metasurface Technologies
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Millimeter-Wave Propagation and Modeling
- Antenna Design and Analysis
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Superconducting and THz Device Technology
- Microwave Engineering and Waveguides
- 2D Materials and Applications
- Phase Equilibria and Thermodynamics
- Ionic liquids properties and applications
- Quantum Dots Synthesis And Properties
- Semiconductor Lasers and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Topological Materials and Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Ga2O3 and related materials
- Transition Metal Oxide Nanomaterials
- Aerogels and thermal insulation
- Thermodynamic properties of mixtures
- Acoustic Wave Resonator Technologies
ARC Centre of Excellence for Transformative Meta-Optical Systems
2023-2025
RMIT University
2018-2025
MIT University
2021-2025
Australian Research Council
2024
Suzhou Institute of Nano-tech and Nano-bionics
2021-2023
Chinese Academy of Sciences
2021-2023
Shanghai Normal University
2020-2021
The University of Adelaide
2020
Nanyang Technological University
2019
Universiti Brunei Darussalam
2015-2016
The fingerprint spectral response of several materials with terahertz electromagnetic radiation indicates that technology is an effective tool for sensing applications. However, few nanometer thin-films dielectrics much longer waves (1 THz = 0.3 mm) challenging. Here, we demonstrate a quasibound state in the continuum (BIC) resonance scale thin analyte deposited on flexible metasurface. large sensitivity originates from strong local field confinement quasi-BIC Fano and extremely low...
Abstract A bound state in the continuum (BIC) is a nonradiating of light embedded propagating modes providing drastic enhancement electromagnetic field and its localization at micro–nanoscale. However, access to such far‐field requires symmetry breaking. Here, it demonstrated that nanometric dielectric or semiconductor layer, 1000 times thinner than resonant wavelength (λ/1000), induces dynamically controllable quasi‐bound (QBIC) with ultrahigh quality factor symmetric metallic metasurface...
Abstract Terahertz confocal imaging allows 3D see‐through of a non‐metallic object with high resolution. Conventional methods acquiring images thick objects suffer from limited depth‐of‐field, constrained depth resolution, and/or inconsistent spatial resolution at different depths. To address these limitations, the intrinsic chromatic aberration typical focusing metasurface is exploited to achieve frequency‐dependent focal lengths. An located within this extended range can be readily...
Abstract Manipulation of terahertz radiation opens new opportunities that underpin application areas in communication, security, material sensing, and characterization. Metasurfaces employed for manipulation phase, amplitude, or polarization waves have limitations efficiency which is attributed to losses the materials constituting devices. Metallic resonators‐based devices suffer from high ohmic losses, while dielectric substrates spacers with relative permittivity loss tangent also reduce...
Polarization control is shown to enhance functionalities of terahertz waves in various applications. As a step toward introducing efficient practical devices operating the band, we propose and experimentally validate free-standing three-layer polarization converter transmission. The device can efficiently convert linearly polarized wave its orthogonal counterpart. Our comprises split-ring H-shaped resonators inserted between two layers wire gratings. sole dielectric material cyclic olefin...
Polarization control of electromagnetic waves has wide applications in the field communications, imaging, and remote sensing. Recent designs periodic two-dimensional devices or metasurfaces employed for polarization are limited efficiency, bandwidth, allowable incidence angle. This is attributed to high dissipation dielectric material used less-optimal device configuration. We propose experimentally validate a reflective linear converter metasurface with acceptance angle terahertz regime....
Frequency-tunablefilters are in demand for applications requiring high spectral selectivity. To this end, frequency-selective surfaces (FSSs) have been widely applied spatial filtering, where varactors well serve the purpose electronic reconfiguration at microwave frequencies. For terahertz applications, however, unavoidably lossy owing to their relatively small cross section required yield values of capacitance. In work, we propose a bandpass multilayer FSS with finesse around 20, 80% power...
Conventionally, a symmetry-protected quasi bound state of the continuum (BIC) becomes achievable by breaking C2 symmetry meta-atoms. Our work exhibits novel approach to achieving dual band quasi-BIC C2v into Cs symmetry. Also, we show that single can be achieved metasurface is composed double gaps split ring resonator (DSRR), and it degrades when are displaced in opposite directions. One observed occurring at around 0.36 0.61 THz respectively with excited x- y-polarized terahertz radiation,...
Abstract Circular polarizers that selectively transmit only one handedness of circular polarization are useful for imaging and wireless communications. Conventional involve 3D chiral structures, which impose fabrication challenges, while typically introducing chirality within a limited bandwidth. To overcome the limitations associated with conventional non‐planar designs, three‐layer metasurface‐based planar polarizer exhibiting strong broadband is presented here. Its superiority over...
Bound state in the continuum (BIC) is a phenomenon that describes perfect confinement of electromagnetic waves despite their resonant frequencies lying continuous radiative spectrum. BICs can be realized by introducing destructive interference between distinct modes, referred to as Friedrich–Wintgen (FW-BICs). Herein, we demonstrate FW-BICs derived from coupled modes individual split-ring resonators (SRR) terahertz band. The eigenmode results manifest are center far-field polarization...
This article presents a narrow-band terahertz absorber using miniaturized unit cells. The is made of three metallic layers separated from each other low-loss cyclic olefin copolymer as dielectric spacers. A high quality factor (Q) obtained first-order resonating structure with additional capacitive loading formed by the top two layers. circuit model developed for analysis and design proposed absorber. designed shows 1% fractional bandwidth more than 90% absorption around center frequency 0.5...
Polarization conversion of terahertz waves is important for applications in imaging and communications. Conventional wave plates used polarization are inherently bulky operate at discrete wavelengths. As a substitute, we employ reflective metasurfaces composed subwavelength resonators to obtain similar functionality but with enhanced performance. More specifically, demonstrate low-order dielectric place commonly planar metallic achieve high radiation efficiencies. demonstration the concept,...
Polarization conversion devices are key components in spectroscopy and wireless communications systems. Conventional terahertz waveplates made of natural birefringent materials typically suffer from low efficiency, narrow bandwidth, substantial thickness. To overcome the limitations associated with conventional waveplates, a quarter-wave metasurface enhanced efficiency wide bandwidth is proposed. The transmissive rigorously designed based on an extended semi-analytical approach employing...
Abstract Gallium nitride (GaN) technology has matured and commercialised for optoelectronic devices in the ultraviolet (UV) spectrum over last few decades. Simultaneously, atomically thin materials with unique features have emerged as contenders device miniaturization. However, lack of successful techniques to produce ultra‐thin GaN prevents access these new predicted properties. Here, this important gap is addressed by printing millimeter‐large nanosheets (NS) (≈1.4 nm) using a simple...
Abstract Reflectarrays offer unique potential for beamforming at terahertz frequencies as they combine the advantages of low‐profile phased arrays and high‐efficiency parabolic antennas. However, one challenge associated with reflectarrays is their bandwidth limitation resulting from nonlinear phase response. To enhance bandwidth, a single‐layer stub‐loaded resonator proposed constructing reflectarrays. This design shows smooth near‐linear response complete 360° coverage around frequency....
In recent years, metasurfaces enabling a slow light effect in the terahertz band have seen considerable achievement. However, most of these advances demonstrated so far are polarization sensitive. this work, we demonstrate polarization-insensitive at spoof surface plasmon-induced transparency windows. Two types based on different lattice layouts, C2 and C4 symmetry, compared. On one hand, metasurface with symmetry displayed 5 ps window around 0.3 THz. other layout achieves maximum 28 The...
Herein, we demonstrate one of the highest terahertz group delay 42.4 ps achieved experimentally at 0.23 THz, on a flexible planar metamaterial. The unit cell metasurface is made up textured closed cavity and another concentric metallic arc. By tuning central angle arc, its intrinsic dipolar mode in destructive interference with spoof localized surface plasmon (SLSP) cavity, which results plasmon-induced transparency phenomenon. measured transmittances as-fabricated samples using...
Polarization conversion is useful for studies of chiral structures in biology and chemistry, polarization diversity communications. It conventionally realized with wave plates, which, however, present challenges due to limited material availability, as well narrow bandwidth low efficiency at terahertz frequencies. To enhance efficiency, the concept Huygens' metasurface adopted here a transmissive half-wave plate. The designed following optimal frequency-independent circuit parameters...
Metamaterials have been engineered to achieve electromagnetically induced transparency (EIT)-like behavior, analogous those in quantum optical systems. These meta-devices are opening new paradigms terahertz communication, ultra-sensitive sensing and EIT-like anti-reflection. The controlled coupling between a sub-radiant super-radiant particle the unit cells of these metamaterial can enable multiple narrow plasmon (PIT) windows over broad band, with considerable group delay electromagnetic...