A5034428152- Diamond and Carbon-based Materials Research
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Photonic and Optical Devices
- High-pressure geophysics and materials
- Underwater Acoustics Research
- Seismic Imaging and Inversion Techniques
- Photorefractive and Nonlinear Optics
- Seismic Waves and Analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Optical Polarization and Ellipsometry
- Mechanical and Optical Resonators
- Laser-Ablation Synthesis of Nanoparticles
- Quantum Information and Cryptography
- Fiber-reinforced polymer composites
- Solid State Laser Technologies
- Atomic and Subatomic Physics Research
- Molecular spectroscopy and chirality
- Force Microscopy Techniques and Applications
- Strong Light-Matter Interactions
Macquarie University
2012-2024
Fraunhofer Institute for Applied Solid State Physics
2020-2024
Euskadiko Parke Teknologikoa
2024
Tecnalia
2024
Hospital Universitario Araba
2024
The University of Queensland
2024
ORCID
2024
Woolcock Institute of Medical Research
2024
The University of Sydney
2024
Association of Electronic and Information Technologies
2023
In this Letter, we show that the electromagnetic duality symmetry, broken in microscopic Maxwell's equations by presence of charges, can be restored for macroscopic equations. The restoration symmetry is shown to independent geometry problem. These results provide a tool study light-matter interactions within framework symmetries and conservation laws. We illustrate its use determining helicity content natural modes structures possessing spatial inversion elucidating root causes some...
This article presents a new method for fabricating highly conductive gold nanostructures within polymeric matrix with subwavelength resolution. The are directly written in precursor-doped photoresist using femtosecond pulsed laser. laser energy is absorbed by two-photon dye, which induces simultaneous reduction of the precursor and polymerization negative photoresist. results nanoparticle-doped lines that exhibit both plasmonic effects, due to constituent nanoparticles, relatively high...
We unveil the relationship between two anomalous scattering processes known as Kerker conditions and duality symmetry of Maxwell equations. generalize these show that they can be applied to any particle with cylindrical symmetry, not only spherical particles original were derived for. also explain role optical helicity in processes. Our results find applications field metamaterials, where new materials directional are being explored.
The nitrogen-vacancy (NV) center in diamond is a promising quantum system for magnetometry applications exhibiting optical readout of minute energy shifts its spin sub-levels. Key material requirements NV ensembles are high NV$^-$ concentration, long coherence time and stable charge state. However, these interdependent can be difficult to optimize during growth subsequent creation. In this work, we systematically investigate the formation properties chemical vapor deposition (CVD) diamond....
Stimulated emission is the process fundamental to laser operation, thereby producing coherent photon output. Despite negatively charged nitrogen-vacancy (NV−) centres being discussed as a potential medium since 1980s, there have been no definitive observations of stimulated from ensembles NV− date. Here we show both theoretical and experimental evidence for using light in phonon sidebands around 700 nm. Furthermore, transition photoionization stimulating wavelength reduced 620 While lasing...
An analysis of light–matter interactions based on symmetries can provide valuable insight, particularly because it reveals which quantities are conserved and ones be transformed within a physical system. In this context, helicity useful addition to more commonly considered observables such as angular momentum. The question arises how treat helicity, the projection total momentum onto linear direction, in practical experiments. paper, we put forward simple but versatile experimental treatment...
Negatively charged nitrogen-vacancy (NV) centers in diamond are promising magnetic field quantum sensors. Laser threshold magnetometry theory predicts improved NV center ensemble sensitivity via increased signal strength and contrast. Here, we experimentally demonstrate laser magnetometry. We use a macroscopic high-finesse cavity containing highly NV-doped low absorbing gain medium that is pumped at 532 nm resonantly seeded 710 nm. This enables 64% power amplification by stimulated emission....
We show that the second order nonlinear generation of light, a process it is assumed to require highly ordered materials, also possible in structures randomly oriented domains. explain theoretically why such disordered efficiency light grows linearly with number Moreover, higher degree disorder, obtained when dispersion made very large, has no negative effect for generation. In conditions, shown be equally efficient any average size domains and grow respect
A novel method for fabricating metallic nanostructures with sub-wavelength resolution in a polymer using simultaneous two-photon initiated reduction of metal salt and polymerization negative photoresist is demonstrated. Gold nanoparticle-doped lines as narrow 200 nm were fabricated. The dependence line-width on laser intensity scan speed are captured well by an analytical model. We created functional gratings planar chiral elements, characterized their optical properties, modeled...
We present a new method to address multipolar resonances and control the scattered field of spherical scatterer. This is based on engineering content incident beam. propose experimentally feasible techniques generate light beams which contain only few modes. The technique uses with well defined component angular momentum appropriate focusing aplanatic lenses. allow for excitation single Mie unprecedented from particles.
Encapsulins, a prokaryotic class of self-assembling protein nanocompartments, are being re-engineered to serve as "nanoreactors" for the augmentation or creation key biochemical reactions. However, approaches that allow encapsulin nanoreactors be functionally activated with spatial and temporal precision lacking. We report construction light-responsive nanoreactor "on demand" production reactive oxygen species (ROS). Herein, encapsulins were loaded fluorescent flavoprotein mini-singlet...
The polarization of the light scattered by an optically dense, random solution dielectric nanoparticles shows peculiar properties when scatterers exhibit strong electric and magnetic polarizabilities. While distribution scattering intensity in these systems typical irregular speckle patterns, helicity incident can be fully conserved polarizabilities are equal. We show that multiple helical beams a dispersion "dual" dipolar nano-spheres leads to pattern exhibiting perfect isotropic constant...
We present how the angular momentum of light can play an important role to induce a dual or anti-dual behaviour on dielectric particle. Although material particle is made not dual, i.e. does interact with electrical field in same way as it magnetic one, spherical behave system when correct excitation beam chosen. study conditions under which this induced be induced.
A technique for multiwavelength phase measurements with quantum light is proposed and applied to the study of optical activity.
Linear scattering processes are usually described as a function of the parameters incident beam. The wavelength, intensity distribution, polarization or phase among them. Here, we discuss and experimentally demonstrate how angular momentum helicity light influence spherical particles. We measure backscattering 4 μm diameter TiO2 single particle deposited on glass substrate. is probed at different wavelengths by beams with total momenta ranging from −8 to +8 units. It observed that spectral...
Abstract Laser threshold magnetometry using the negatively charged nitrogen-vacancy (NV − ) centre in diamond as a gain medium has been proposed technique to dramatically enhance sensitivity of room-temperature magnetometry. We experimentally explore diamond-loaded open tunable fibre-cavity system potential contender for realisation lasing with NV centres. observe amplification transmission cavity-resonant seed laser at 721 nm when cavity is pumped 532 and attribute this stimulated emission....
Nitrogen Vacancy centers in diamond interact with local magnetic and electric fields, temperature, strain, pressure. Their ease of operation exceptional performance has led to the emergence a first generation commercial NV-based quantum sensors, as scanning-probe systems, giving them wide recognition technology most imminent market potential. In recent years, there is an effort advance TRL those technologies through several European initiatives.
Single substitutional nitrogen atoms Ns0 are the prerequisite to create nitrogen-vacancy (NV) centers in diamonds. They not only serve as electron donors desired NV− center and provide charge stability against photo-ionisation but also main source of decoherence. Therefore, precise quick determination concentration is a key advantage multitude NV-related research terms material improvement well applications. Here, we present method determine based on absorption spectroscopy UV-Visible range...
Chiral resolution using non-functionalized mesoporous particles is demonstrated for a variety of enantiomeric pairs. This achieved through the use supramolecular templated silica materials prepared with guanosine monophosphate (NGM-1) and folic acid (NFM-1) which enable direct chiral transcription onto surface mesopores after solvent extraction post calcination template. The selectivity kinetics are measured by circular dichroism (CD) spectroscopy on adsorbed molecules different affinities...