A5032525918- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Antenna Design and Analysis
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Thin-Film Transistor Technologies
- Molecular Junctions and Nanostructures
- Microwave and Dielectric Measurement Techniques
- Nanowire Synthesis and Applications
- Terahertz technology and applications
- Experimental and Theoretical Physics Studies
- Full-Duplex Wireless Communications
- Advanced biosensing and bioanalysis techniques
- Electromagnetic Scattering and Analysis
- Radiation Effects in Electronics
- Gold and Silver Nanoparticles Synthesis and Applications
- Advancements in Semiconductor Devices and Circuit Design
- CCD and CMOS Imaging Sensors
- Optical Coatings and Gratings
- Music Technology and Sound Studies
- Semiconductor Lasers and Optical Devices
- Radio Wave Propagation Studies
- Electromagnetic Compatibility and Noise Suppression
University College London
2017-2023
Australian National University
2011-2013
Interest in the electromagnetic properties of loop structures has surged with recent appearance split-ring resonator meta-materials (SRRs) and nano-antennas. Understanding resonances, anti-resonances, harmonics these loops is key to understanding their response a wide range excitation wavelengths. We present classical analytical solution for input impedance structure circumference on order wavelength, we show how identify resonances from function. transform into new RLC formulation that each...
Modern antenna theory forms the bulwark of our knowledge how radiation and metallic structures interact in radio frequency (RF) microwave (MW) regions. The has not yet penetrated terahertz, infrared, optical regions to same degree. In this paper, we provide a rigorous analysis closed circular loop antennas from first principles. Using theory, tie together their long wavelength behavior with at short wavelengths through visible region. We analytic for input impedance, current, quality factor,...
The analytical theory of perfectly conducting thin-wire closed-loop antennas with multiple loads in the periphery was formally derived 1950s and 1960s. In this paper, it is extended to loop nanorings for use communications, "Internet things," as metamaterials. new derivation relies on recent work from 2013 that incorporates surface impedance metal wires into standard theory, thus pushing its applicability gigahertz, terahertz, optical regimes. Surface effects cause losses phase shifts...
Impedance loading is a common technique traditionally used in the RF to enhance performance of an antenna, but its application optical regime not as rigorously studied. This mainly due lack exact analytical expressions that can be rapidly predict radiation properties loaded nanoantennas. paper will derive set useful for far-field loop antennas with arbitrary number lumped impedances are valid from RF-to-optical regimes. The validated full-wave solvers and evaluated more than $100\times $...
Many types of wavelength-scale optical structures have been investigated for light trapping in solar cells. Nano-loops not yet studied on cells, even though they play a central role arrays meta-materials the microwave (MW) region. In this paper, we use standard antenna theory to provide rigorous analysis closed circular metallic loops as antennas infrared (IR) and region (OR), regions activity. We an exact impedance model approximate RLC from which determine key design factors (resonances,...
First Page
Elliptical loop antennas represent a natural generalization of circular antennas, which have themselves received substantial attention in the last decade. The characteristics latter were extended to high gigahertz and low terahertz region, where lossy materials play major role. This article seeks extend these derivations elliptical loops as well demonstrate that loops, possessing more degrees freedom than their counterparts, afford additional benefits. asymmetric geometrical parameters force...
Impedance loading of antennas has been interest for more than half a century due to its ability fundamentally change an antenna's operating characteristics.Variable reactive can be employed configurability the frequency response, polarization and far-field properties antenna.Closed-form expressions current input impedance thin-wire loop antenna with loads in periphery were derived RF optical regimes 1965 2017, respectively.Meanwhile, closed-form radiation circular 1996 2017.This paper...
The loading of antennas greatly expands the design space by making otherwise challenging performance goals more easily realizable. It is demonstrated that pairing analytical theory loop with a powerful global optimizer can achieve designs offer significant radiation pattern shaping in both RF and optical regimes.