The capability of 2D IR spectroscopy for elucidating time-evolving structures is enhanced by a programmable mid-IR pulse shaper that greatly improves the ease, speed and accuracy of data collection. We demonstrate our technique on a model metal carbonyl compound and then apply it to study the structural disorder of amyloid fibers composed of aggregated human islet amyloid polypeptide (hIAPP).
Holographic phase conjugation is used to focus light onto sub-wavelength holes in a gold film directly on top of a photorefractive lithium niobate crystal. This could lead to a high-numerical-aperture-focusing system.
A photonic crystal slab nanocavity with a single InAs quantum dot in a field antinode is a promising system for cavity QED because of the cavitypsilas small volume and the dotpsilas stationary position.
This study compares the experimental results of absorption and refractive index of a probe laser measured in a strongly driven two-level atom with the results measured in a degenerate two-level system using pump-probe spectroscopy. This work demonstrates the possibility of realization an anomalous dispersive transparent medium using the strongly driven 4s21S0 - 4s4p 1P1 Ca transition. Absorption...
Ultrafast laser pulse shaping makes it possible to observe nonlinear signatures, such as self phase modulation and sum frequency absorption, at safe laser powers for tissue. Neuronal activation and melanoma diagnosis are two early targets.
Large scale optical integration is enabled by high index contrast materials and building blocks. We highlight recent advances in the miniaturization of optical elements and of dense integration of planar lightwave circuits for telecommunications and RF photonic applications.
Dispersion control and active materials integration have yielded plasmonic components including i) three-dimensional single layer plasmonic metamaterials ii) all-optical, electro-optic and field effect modulation of plasmon propagation iii) plasmon-enhanced absorption in solar cells.
We present crystalline whispering gallery mode resonators (WGMR) operating as the efficient Raman lasers. Fundamental limitations on optical quality (Q) factor are discussed. A new resonant scattering phenomenon is observed.
The vertical and horizontal polarization modes of a cavity QED system become correlated through a single atom. Their auto-correlation and cross-correlations show an avenue for the study of the steady state entanglement in this system.
The article presents experimental results demonstrating Xe(L) spectral hole-burning and corresponding saturated amplification on the Xe31+ transition array. Xe(L) single-pulse spontaneous emission spectrum was recorded with a CCD equipped von Hamos mica spectrograph. A spectral comparison of the amplified spectrum with the spontaneous emission profile is also presented.
We developed microfluidic devices, imaging algorithms and femtosecond laser microsurgery technologies to manipulate large numbers of small-animals on a single chip for sub-cellular resolution high-throughput genetic and drug screens on neural degeneration and regeneration.
Potential and possibility of a photonic crystal optical buffer is discussed and some recent advances are presented. A wideband dispersion-free tunable delay is experimentally demonstrated using SOI chirped photonic crystal coupled waveguides.
Metamaterials are expected to open a gateway to unprecedented electromagnetic properties and functionality unattainable from naturally occurring materials, thus enabling a family of new "meta-devices". We review this new emerging field and significant progress in developing metamaterials for the optical part of the spectrum. Specifically, we describe recently demonstrated artificial magnetism...
Two device geometries that enable structural coexistence are micro-mechanical and optical resonators. In one geometry, a micro-cantilever mechanical resonator also functions as a mirror in a high-finesse optical cavity. In a second, opto-mechanical coexistence takes the form of a micron-scale silica toroid that exhibits both high-Q radio-frequency mechanical resonances and optical resonances.
Recent experiments towards deterministic quantum information processing with single atoms and single photons in a high-finesse optical cavity are discussed, including a single-photon server and an atom-photon interface.
We will describe experimental realization of two novel approaches to quantum interface between single photons and spins in atomic and solid-state systems. Progress towards implementation of potential applications of these techniques will be discussed.
Using scanning Kerr-rotation microscopy, we directly image the injection and subsequent transport of spin-polarized electrons in semiconductors. We discuss optical spin injection as well as electrical spin injection in hybrid Fe/GaAs spin transport devices.
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