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We demonstrate lensless diffractive microscopy with 92 nm resolution using 13.5 nm light from high harmonic generation. Fast image retrieval with Fourier transform holography is shown, and we present paths to refining the images to higher resolution.
We demonstrate the inhomogeneous character of interface roughness broadening in intersubband transitions and analyze its impact on temperature dependence of the gain and absorption spectra in the quantum cascade laser.
Sustained improvements in epitaxial materials, device design, and packaging have positioned light-emitting diodes (LEDs) as the solution for future lighting needs worldwide. State-of-the-art LED performance is reviewed along with discussion of challenges and future outlook.
When using lidar to measure small depolarization values, coupling of polarization planes in the system is of significant concern.We employ hardware polarization compensation to reduce system polarization cross-talk, improving depolarization estimates.
Dynamic mass density of a composite can differ from its static counterpart when there are relative motions between the components. Realizations of negative dynamic mass density composites and their theoretical underpinnings will be presented.
A pump combiner with single-mode PM signal feed-through designed for an air-clad photonic crystal fiber is demonstrated. Signal coupling is realized by a novel taper element allowing single-mode guidance at a taper ratio of 3.7.
We demonstrate quantum teleportation of a coherent state as cluster computation using a four-mode linear cluster state. This is the first example of realization of cluster computation in continuous-variable systems.
We will discuss the implementation of high fidelity entangling operations based on a global interaction of a single laser beam with a string of trapped ions.
A density-matrix based theory of transport and lasing in quantum-cascade lasers reveals that large disparity between lasing linewidth and tunneling broadening changes the design guidelines to favor strong coupling between injector and upper laser level.
We study soliton dynamics in random propagation-invariant potentials, and find that transport varies from classical-particle transport when correlation distance is large, to the short-range correlation regime, where these particle-like entities experience the transport of waves.
A new scattering theory for describing disorder-induced multiple scattering events in photonic crystal waveguides is presented with matching experiments on GaAs samples. Our self-consistent 3D model successfully reproduces the rich experimental features including band-edge resonances.
Optical waveguides formed from coupled ultrahigh-Q cavities are investigated by finite-difference time-domain (FDTD) simulation. Ultra-high group velocity dispersion together with a group velocity as low as 3times10-5 c is predicted at the band edge. It is shown that full compensation of the group velocity dispersion for chip free slow light (~c/100) over a bandwidth of 230 GHz is possible using a...
A quantum ghost imaging scheme is modified to discriminate between two spatially non-overlapping objects using a single pair of entangled photons. The ldquoghostrdquo image information is extracted by means of holographic filtering and coincidence detection.
We demonstrate experimentally the advantages of driving laser-assisted photoemission from surfaces with long-wavelength-IR light. We show that applications in probing surface dynamics benefit from using longer-wavelengths since many side effects of strong fields are suppressed.
Supplemental ultraviolet-B radiation (280-320 nm) can increase phenolic compounds in plants and help to preserve them during storage after harvest. The nutritional significance of these compounds and the use of UV-LEDs will be discussed.
We investigate the temperature sensitivity of silicon-based optofluidic photonic crystal double-heterostructure resonators. We systematically study the optical properties of these resonators as function of temperature, specifically demonstrating the potential for creating temperature-insensitive photonic crystal devices.
We investigated the effects of prestrained layers on piezoelectric fields and indium incorporation in blue-emitting InGaN/GaN quantum wells by using reverse-biased electroreflectance spectroscopy. We compared two sets of samples, which have identical structures except an insertion of an additional UV quantum well at the bottom of the blue-quantum well. Indium composition of quantum wells with the...
We employ a novel dynamical approach to study the slow saturable absorber mode-locking with noise. We obtain explicit expressions for the condition of pulse existence and continuum stability, the pulse power and the minimal pulse width, and present the guidelines for optimal system configuration.
A slow increase of the amplitude and frequency of a mechanical harmonic oscillator leads to squeezing effects, which are related to the use of the adiabatic approximation. An order of magnitude for this squeezing is calculated and it is suggested to use the present theory for mechanical oscillators in traps and for resonant detectors. The other extreme case of 'impact' interaction is analyzed in which...
Enhanced generation of H2O2, modulations in metabolic activity, and the ldquoby-standerrdquo effect from malignant human brain cancer cells due to red He-Ne laser exposures have been quantified and found to be light exposure dose dependent. The findings herein support evidence for an important role for light induced H2O2 to mediate biomodulations.
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