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Nanocrystals that have unusual or exceptional optical properties have shown promise as transformative probes for biological imaging. Phosphorescent upconverting nanoparticles (UCNPs) have proven to be especially promising as biological labels, and single-particle studies of UCNPs have shown that they exhibit nearly ideal properties as single molecule imaging probes. UCNPs absorb two or more photons...
Over the last fifteen years, the tailoring of a light field for manipulating the dynamics of a system at the quantum level has taken a prevalent role in modern atomic, molecular and optical physics. As first described by Keldysh [1], the ionization of an atom by an intense laser field will evolve depending upon the light characteristics and atomic binding energy. Numerous experiments have thoroughly...
We present an analytical approach that adequately describes the nonlocal optical response for plasmonic nanowire metamaterials. The technique provides an insight into the origin of the additional wave and allows implementation additional boundary conditions.
We optically trap individual nanodiamonds hosting a single Nitrogen Vacancy center and demonstrate a novel route for both non-invasive 3D vectorial magnetometry and sensing of the local density of states in a liquid environment.
Swept-wavelength laser sources are an essential and enabling technology in the growing clinical adoption of optical coherence tomography (OCT). In this talk, we will review the advantages and limitations of available OCT source technologies.
We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
Photoluminescence as a function of the time delay between two ultrafast laser pulses measures the nonlinear emission dynamics of quantum dots coupled to photonic crystal cavities and distinguishes between exciton and biexciton emission.
We present a review on the use of molecular nanomotors to probe the near field of metal nanoparticles. Both the experimental and theoretical point of view will be presented and discussed.
We report the experimental implementation of a bulk metamaterial with an all-angle left-handed response in the ultraviolet. Using this metamaterial, we fabricate an optically switchable Veselago flat lens capable of imaging arbitrary two-dimensional objects beyond the near field.
Transparent conductive oxides (TCOs) as substitutes to metals could offer many advantages for low-loss plasmonic and metamaterial (MM) applications in the near infrared (NIR) regime. By employing a lift-off process, we fabricated 2D-periodic arrays of TCO nanodisks and characterized the material's plasmonic properties to evaluate the performance of TCOs as metal substitutes.
We demonstrate a new type of electrically tunable strong coupling between a planar metamaterial layer and an ultra-thin epsilon-near-zero layer made of a doped semiconductor. This can find novel applications in chip-scale infrared optoelectronic devices.
An optical fiber taper placed in the near field of a “split-beam” photonic crystal nanobeam cavity with a physical gap at the cavity center breaks the system's vertical dielectric symmetry, enabling selective optomechanical coupling to multiple cantilever resonances using a single optical nanocavity mode.
Despite unique and fascinating capability in subwavelength optics, active control of optical plasmon resonance has been hampered by drastically weak optical response of free carriers at optical frequency. We demonstrate efficient control of optical plasmon resonance in gold nanorod with graphene by electrical gating.
We report a broad range of swept source performances based on a highly-flexible external cavity laser architecture embodied within a compact butterfly package. Multiple spectral regions from 830nm to 1630nm and sweep frequencies from 1kHz to 200kHz are demonstrated.
We present modulators developed in the projects “HELIOS”, and “UK Silicon Photonics”, integration with modulator driver to produce the first silicon modulator fully integrated with BiCMOS, and multiplexed photonic crystal modulators for ultra-low power operation.
Improvement of resolution beyond the Rayleigh limit is obtained by monitoring non-resonant four wave mixing generated by the target in a confocal scanning microscope configuration.
We investigate the complex conductivity of silver nanowire thin films using terahertz time-domain spectroscopy. The measured conductivity shows a characteristic non-Drude response unlike bulk metals. The interesting behavior is explained by the Gans approximation and the Drude-Smith model.
We present the design and demonstration of ultra-thin plasmonic color filters, providing a powerful approach for subtractive color filtering with high spatial resolution and ultra-compact architectures on sub-micrometer scales.
We have proposed and developed a scanning laser terahertz (THz) imaging system using a 1.56μm femtosecond fiber laser for high-spatial resolution and high-speed measurement. The laser pulses are scanned over a 2D THz emitter plate such as DASC(4'-dimenthylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate), GaAs, and ZnTe crystals by a galvano meter. In this system, THz wave pulses locally generated...
Crossed polarized excitation and detection has been used to improve signal-to-noise ratio in an optical nano-particle sensor exploiting guided-resonance-modes in photonic crystal membranes. The sensor can detect particles with a diameter less than 40 nm.
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