The amplification of light by a single excited molecule in free space is demonstrated in this paper. The extinction effect is the result of a destructive interference between the incident laser beam and the coherently scattered light from the molecule in the ground state. Thus, inversion of the population should lead to a phase shift of the scattered light and amplification of the laser light.
We demonstrate robust and efficient routing of single photons using a microtoroidal cavity QED system. Single photons from a coherent input are sorted to one output of the fiber with excess photons redirected to the other.
We provide an overview of the capabilities and limitations of slow light optical buffers. A number of fundamental waveguide properties such as loss and dispersion severely limit the opportunities for practical slow light optical buffering.
The production of highly energetic beams of both electrons and ions is a major part of the experimental programme at the Central Laser Facility (CLF), STFC Rutherford Appleton Laboratory. Every year sees a significant number of experiments done in both areas. This has been complemented by theoretical studies that have been carried out at the CLF and UK universities. In a recent consultation on plans...
Interferometric lithography provides a facile technique for the fabrication of large-areas of nanophotonic structures. Examples of both linear and nonlinear responses will be drawn from plasmonics, metamaterials, and photonic crystals.
Many free space quantum key distribution systems are restricted to operation at night. Implementing spectral, spatial and temporal filtering techniques, we were able to establish a secure key transmission over several days using entangled photons.
We teleport quantum information between two distant ytterbium ions trapped in different vacuum chambers separated by one meter. Full state tomography shows that the heralded probabilistic process employed has a fidelity of 90%.
Recently scientists have made considerable progress in using optical phase to control physical, chemical and biological processes. In a collaboration between the University of Toronto and the University of Iowa, we have shown how optical phase can be used to control electron density and currents as well as spin density and spin currents in bulk (3-D) or quantum well (2-D) semiconductors as well as...
We experimentally observe an opto-mechanical whispering-gallery [WG] resonator vibrating at 11 GHz. We use optical electrostriction to drive mechanical vibration at frequencies which scale inversely with optical wavelength, irrespective of micro-resonator size.
The challenges and prospects for use of UV LED's in the water disinfection industry, that treats water flows ranging from millilitres per minute to multiple millions of cubic meters per day, will be discussed.
We demonstrate single-mode, surface-emitting terahertz lasers at lambdaap110 mum employing photonic-crystal resonators. The devices employ metal-metal waveguides, and the photonic-crystal lattice is implemented by the sole patterning of the top metal contact, without deep-etching the semiconductor in the photonic crystal holes. The device emission wavelength correctly tunes with the photonic crystal...
We theoretically investigate light localization and local density of states manipulation in aperiodic photonic structures and discuss their applications as pseudo-random lasers and label-free optical biosensors.
Lighting applications are presently limited by the lack of efficient LEDs across the visible spectrum. We review materials challenges that underlie the ldquogreen-yellow gaprdquo in LED efficiency and describe emerging approaches for bridging that gap.
Measuring UV-excited fluorescence from individual airborne particles is a leading technique for fast, non-specific detection of biological threat aerosols. UV-LEDs, available at several wavelengths, enable cost reduction of these detectors while presenting additional design challenges.
GeoEye-1 consists of the world's most advanced commercial multi spectral imaging sensor, latest ACS system star tracker and military grade GPS receiver. This LEO satellite is capable of providing 41 centimeter spatial resolution from 681 km in space. This talk will outline the system specification and performance of this world class imaging satellite.
We introduce a new class of coherent metamaterials where regular ensembles of meta-molecules show collective, coherent narrow-band response leading to unusual electromagnetic properties and potential applications in the lasing spaser.
Summary form only given. For decades, the electron energy loss spectroscopy (EELS) in a transmission electron microscope has been used to explore electronic and electromagnetic excitations of solids. In particular, the low-loss energy domain (from few eV to 50 eV) has been exploited for studying dielectric properties of materials. However, so far, only excitations in the UV range and above were investigated...
Thermal phase noise in optical interferometry can be compensated by exploiting coherence for underlying stochastic displacements and strains. The phase upon reflection from a fluctuating mirror's surface can thereby have reduced sensitivity to thermal noise.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.