A5012281799- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Antenna Design and Analysis
- Advanced biosensing and bioanalysis techniques
- Thermal Radiation and Cooling Technologies
- Optical Coatings and Gratings
- Iron Metabolism and Disorders
- Quantum Mechanics and Non-Hermitian Physics
- Strong Light-Matter Interactions
- Neural Networks and Reservoir Computing
- Terahertz technology and applications
- Optical Wireless Communication Technologies
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Advanced Sensor and Energy Harvesting Materials
- Plant Micronutrient Interactions and Effects
- Biosensors and Analytical Detection
Nottingham Trent University
2020-2025
Photonics (United States)
2025
Royan Institute
2024
Academic Center for Education, Culture and Research
2024
Arak University
2022-2023
Institut des Molécules et Matériaux du Mans
2023
Le Mans Université
2023
Imperial College London
2013-2022
Australian National University
2016-2021
ARC Centre of Excellence for Transformative Meta-Optical Systems
2020-2021
Nanoplasmonics has recently revolutionized our ability to control light on the nanoscale. Using metallic nanostructures with tailored shapes, it is possible efficiently focus into nanoscale field 'hot spots'. High enhancement factors have been achieved in such optical nanoantennas, enabling transformative science areas of single molecule interactions, highly enhanced nonlinearities and waveguiding. Unfortunately, these large enhancements come at price high losses due absorption metal,...
Abstract Recently, a large number of experimental and theoretical works have revealed variety plasmonic nanostructures with the capabilities Fano resonance (FR) generation. Among these structures, oligomers consisting packed metallic nanoelements certain configurations been significant interest. Oligomers can exhibit FR independently polarization direction based on dipole–dipole antiparallel modes without need to excite challenging high‐order modes. The purpose this review article is provide...
The quest for nanoscale light sources with designer radiation patterns and polarization has motivated the development of nanoantennas that interact strongly incoming are able to transform its frequency, radiation, patterns. Here, we demonstrate dielectric AlGaAs efficient second harmonic generation, enabling control both directionality nonlinear emission. This is enabled by specialized III–V semiconductor nanofabrication high-quality nanostructures embedded in optically transparent low-index...
Abstract Dynamical tuning of the nonlinear optical wavefront allows for a specific spectral response predefined profiles, enabling various applications nanophotonics. This study experimentally demonstrates dynamical switching images generated by an ultrathin silicon metasurface supporting high‐quality leaky mode, which is formed partially breaking bound‐state‐in‐the‐continuum (BIC) collective magnetic dipole (MD) resonance excited in subdiffractive periodic systems. Such quasi‐BIC MD state...
All‐dielectric metasurfaces provide a powerful platform for new generation of flat optical devices, in particular, applications telecommunication systems, due to their low losses and high transparency the infrared. However, active reversible tuning such remains challenge. This study experimentally demonstrates theoretically justifies novel scenario dynamical all‐dielectric based on temperature‐dependent change refractive index silicon. How design an metasurface with sharp resonances by...
We demonstrate that a dielectric anapole resonator on metallic mirror can enhance the third harmonic emission by two orders of magnitude compared to typical an insulator substrate. By employing gold under silicon nanodisk, we introduce novel characteristic mode through spatial overlap resonantly excited Cartesian electric and toroidal dipole modes. This is remarkable improvement early demonstrations in which modes interfere off-resonantly. Therefore, our system produces significant...
High index dielectric nanostructure supports different types of resonant modes. However, it is very challenging to achieve high-Q factor in a single subwavelength nanoresonator due non-hermtian property the open system. Here, we present universal approach finding out series modes nonspherical nanocavity by exploring quasi-bound state continuum. Unlike conventional method relying on heavy computation (ie, frequency scanning FDTD), our built upon leaky mode engineering, through which many can...
Abstract It is well established that for symmetry‐protected bound states in the continuum (BICs), introducing broken geometry symmetry a dielectric metasurface transforms such BIC into quasi‐BIC (QBIC) with high‐quality factor (Q‐factor). Typically, smaller asymmetry parameter, larger Q‐factor. However, it very challenging to fabricate nanostructures an ultra‐small thus limiting measured Q‐factor of QBIC. In this work, authors demonstrated BICs can be sustained at Γ‐point asymmetric...
Symmetry-protected bound states in the continuum (SP-BICs) are one of most intensively studied BICs. Typically, SP-BICs must be converted into quasi-BICs (QBICs) by breaking unit cell's symmetry so that they can accessed external excitation. The symmetry-broken usually results a varied resonance wavelength QBICs which also highly sensitive to asymmetry parameters. In this work, we demonstrate with stable realized translational an all-dielectric metasurface. cell metasurface is made silicon...
Dielectric metasurfaces play an increasingly important role in enhancing optical nonlinear generations owing to their ability support strong light-matter interactions based on Mie-type multipolar resonances. Compared composed of the periodic arrangement nanoparticles, inverse, so-called, membrane offer unique possibilities for supporting resonances, while maintaining small unit cell size, large mode volume and high field enhancement frequency conversion. Here, we theoretically experimentally...
Here we present a roadmap on Photonic metasurfaces. This document consists of number perspective articles different applications, challenge areas or technologies underlying photonic Each will introduce the topic, state art as well give an insight into future direction subfield.
Abstract Active optical antennas, a novel Schottky photodiode design, have drawn significant attention due to their advantages of near‐field enhancement and hot‐electrons generation for sub‐bandgap photodetection. However, the reported active antenna‐based Si photodetectors shown low photoresponse in limited wavelength range below 1650 nm. This work reports hybrid nanoantenna (NA)‐nanopillar (NP) ultrawide wavelength‐tunable photodetection at room temperature, without using any filters. The...
We report the experimental realization of efficient tunable nanosources second harmonic light with individual multiresonant log-periodic optical antennas. By designing nanoantenna a bandwidth several octaves, simultaneous enhancement fundamental and fields is observed over broad range frequencies, leading to high conversion efficiency, together an effective order susceptibility within values provided by widespread inorganic crystals. Moreover, geometrical configuration makes generated signal...
Plasmonic resonances with a Fano lineshape observed in metallic nanoclusters often arise from the destructive interference between dark, subradiant mode and bright, super-radiant one. A flexible control over profile characterized by its linewidth spectral contrast is crucial for many potential applications such as slowing light biosensing. In this work, we show how one can easily but significantly tailor overall plasmonic nanocluster systems, example, quadrumers pentamers, selectively...
Optical nanoantennas have shown a great capacity for efficient extraction of photons from the near to far-field, enabling directional emission nanoscale single-photon sources. However, their potential generation and multi-photon quantum states remains unexplored. Here we demonstrate experimentally two-photon at telecommunication wavelengths based on spontaneous parametric down-conversion in an optical nanoantenna. The antenna is crystalline AlGaAs nanocylinder, possessing Mie-type resonances...
Optical antennas represent an enabling technology for enhancing the detection of molecular vibrational signatures at low concentrations and probing chemical composition a sample in order to identify target molecules. However, efficiently detecting different modes determine presence (or absence) species requires multispectral interrogation window several micrometers, as many molecules present informative fingerprint spectra mid-infrared between 2.5 10 μm. As most nanoantennas exhibit...
Nonlinear effects at the nanoscale are usually associated with enhancement of electric fields in plasmonic structures. Recently emerged new platform for nanophotonics based on high-index dielectric nanoparticles utilizes optically induced magnetic response via multipolar Mie resonances and provides novel opportunities nonlinear optics. Here, we observe strong second-harmonic generation from AlGaAs nanoantennas driven by both resonances. We distinguish experimentally contribution analyzing...
We study the third-harmonic generation by structured light in subwavelength silicon nanoparticles which support both electric and magnetic multipolar Mie resonances. By tailoring vectorial structure of pumping light, we may control strength polarization composition excited harmonic fields. In this way, generate nonlinear fields with radial or azimuthal polarizations addressing selectively a different type resonances, also enhancing suppressing optically induced response.
We introduce a plasmonic-semiconductor hybrid nanosystem, consisting of ZnO nanowire coupled to gold pentamer oligomer by crossing the hot-spot. It is demonstrated that system exhibits second harmonic (SH) conversion efficiency ∼3 × 10–5%, which among highest values for nanoscale object at optical frequencies reported so far. The SH intensity was found be ∼1700 times larger than from same excited outside Placing high nonlinear susceptibility materials precisely in plasmonic confined-field...
Nonlinear light sources are central to a myriad of applications, driving quest for their miniaturisation down the nanoscale. In this quest, nonlinear metasurfaces hold great promise, as they enhance effects through resonant photonic environment and high refractive index, such in high-index dielectric metasurfaces. However, despite sub-diffractive operation at fundamental wave, condition is not fulfilled nonlinearly generated harmonic waves, thereby all date emit multiple diffractive beams....
We demonstrate an optical image processing technique in the form of edge detection object by exploring angular selectivity Mie-resonant dielectric metasurfaces hexagonal symmetry. examine effect both electric and magnetic Mie-type resonances on spatial dispersion reveal that resonance provides better detection. also explore polarization sensitivity process show our metasurface is independent. Our results shed light underlying mechanisms with resonant open new opportunities for ultracompact...
Infrared imaging is a crucial technique in multitude of applications, including night vision, autonomous vehicles navigation, optical tomography, and food quality control. Conventional infrared technologies, however, require the use materials like narrow-band gap semiconductors which are sensitive to thermal noise often cryogenic cooling. Here, we demonstrate compact all-optical alternative perform metasurface composed GaAs semiconductor nanoantennas, using nonlinear wave-mixing process. We...
Abstract Modern nanophotonics has witnessed the rise of “electric anapoles” (EDAs), destructive interferences electric and toroidal dipoles, actively exploited to resonantly decrease radiation from nanoresonators. However, inherent duality in Maxwell equations suggests intriguing possibility “magnetic anapoles,” involving a nonradiating composition magnetic dipole dipole. Here, hybrid anapole (HA) mixed character is predicted observed experimentally via dark field spectroscopy, with all...
To date, second-harmonic generation (SHG) at nanoscale has been concentrated on employing high-refractive-index nanostructures, owing to the strong field confinement deep subwavelength scales based optically resonant effects. However, low-index nanostructures generally exhibit weaker effects and lower confinement. address this issue, by harnessing large nonlinearity of LiNbO$\mathrm{_3}$, we propose a novel approach employ guided resonances bound states in continuum (BICs) with...