Research in the NanoPhotonics Lab focuses on novel functional materials like photonic crystals, semiconductor quantum dots, and carbon nanotubes. They offer rich opportunities for fundamental research of light-matter interaction at the nanoscale and offer new routes for semiconductor device applications in optical information processing. Current research topics include non-classical light sources for quantum cryptography, holographic lithography of photonic crystals and plasmonic metamaterials, carbon nanotube quantum dots for applications in nanoelectonics and nanophotonics. As a long term goal, we are seeking to combine individual functional devices on a chip in order to create optical circuits which have unprecedented functionality, orders of magnitude higher bandwidth compared to electronic circuits, and yet unforeseen abilities.
Understanding of ultrafast molecular dynamics induced by intense laser pulses, and development of laser control methods to manipulate with quantum systems; theory of coherent stimulated Raman scattering (CSRS) and coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy in application to noninvasive biological imaging and investigation of ultrafast dynamics of biological systems on real-time scale; and the design of new quantum control methods including ultrafast optical pulse sculpting and coupling it to other advanced techniques, such as adaptive learning algorithms. We investigate (1) the possibility of selective excitation of predetermined vibrations in chemical and biological systems, (2) dissociation of small molecules following core-electron excitation that requires x-ray photon energies, and (3) photoinduced reactions in large molecules, e.g., photoisomerization in the rhodopsin molecule, a key intermediate in the vision process.
Theoretical investigations into the dynamical properties of atomic and molecular Bose-Einstein condensates and quantum degenerate Fermi gases. Particular areas of interest include nonlinear wave-mixing of matter waves, quantum statistics and coherence properties of bosonic and fermionic matter waves, atomic recoil effects in the interaction between light and ultracold atoms, atom-molecule conversion via Feshbach resonances, and photoassociation and phase sensitivity in atom interferometers. Applications include precision interferometers for inertial navigation, gravity gradiometers for geophysical prospecting, and matter wave lithography. Other areas of interest include open quantum systems, control of environmental decoherence, and cavity quantum electrodynamics.
- Ultrafast Laser Spectroscopy and Communication Laboratory - Prof. R. Martini (WWW.FEMTOLAB.US)
The realization of ultrahigh-speed communication networks at and above Terahertz (THz) bandwidth is one of today's most challenging problems, as the limiting factors are given by fundamental physical properties and laws. To overcome the restrictions, new concepts and materials have to be invented and utilized. In this laboratory, we investigate the high-speed response of new lasers and materials, as well as passive and active optical systems using ultrashort laser pulses (<100fs) to develop towards higher speed networks. In addition to this, the ultrashort laser techniques in this laboratory enable us to apply many different measurement techniques, accessing the world of the "ultrafast." Time-resolved Terahertz (THz) spectroscopy setup, for example, gives us the unique ability to measure optical, as well as electrical, properties in this ultrahigh-speed frequency region and use it for new and fascinating applications in this new "frequency world."
- Quantum Information Science and Technology Group - Prof. T. Yu
The aims of quantum information science are the study of how to use entanglement as a fundamental resource for applications in various information processing tasks such as quantum secure communication and quantum computation. Quantum information is also important to provide a deeper understanding of quantum many-body physics and quantum foundation. Research in this group focuses on theory and implementation of quantum information science in the domains of quantum optics and mesoscopic physics. Major research interests include entanglement dynamics and decoherence of small systems; quantum Monte Carlo simulations; continuous quantum measurement; quantum cryptography; quantum feedback control; quantum phase transition and topological quantum computation.
Theoretical research on quantum electron transport, resonant tunneling devices, and optical devices; modeling and simulation of semiconductor devices and acoustic wave devices and networks; and large-scale, massively-parallel simulations of MM-wave spectroscopes and fiber-optical communication devices.
Quantum field theory of many-body systems; nonequilibrium and thermal Green's function methods in solid state and semiconductor physics and response properties; open quantum systems; nonequilibrium fluctuations; surface interactions; quantum plasma; high magnetic field phenomena; low dimensional systems; dynamic, nonlocal dielectric properties, and collective modes in quantum wells, wires, dots, and superlattices; nanostructure electrodynamics and optical properties; nonlinear quantum transport theory; magnetotransport, miniband transport, hot electrons, and hot phonons in submicron devices; mesoscopic systems; spintronics; relaxation and decoherence in semiconductor nanostructures; nanoelectrical mechanical systems (NEMS); and device analysis for quantum computations.
Atmospheric/Space Research, including satellite remote sensing of the environment; measurements of broadband and spectral radiation, including solar ultraviolet (UV) radiation; inference of cloud and stratospheric ozone effects on UV exposure; numerical modeling of geophysical phenomena and comparison with measurements; and study of radiation transport in turbid media, such as the atmosphere-ocean system and biological tissue.
The theme of this laboratory is the development and application of laser-based methods for remote sensing, chemical analysis, and optical communications. Techniques used include frequency modulation spectroscopy, laser vibrometry, and free space optical communications. The laboratory is equipped with a wide range of laser sources and detectors, high-frequency electronic test equipment, computer-controlled measurement systems, and a Fourier transform infrared spectrometer.
Electron collisions with atoms, molecules, and free radicals; experimental and theoretical studies of excitation, dissociation, and ionization processes; measurement of electron attachment and detachment cross-sections and rates; collision-induced emission spectroscopy; laser-induced fluorescence experiments; collision processes in low-temperature plasmas; atomic processes in atmospheric pressure plasmas; application of collisional and spectroscopic data to plasma diagnostic techniques; atomic, molecular, and plasma processes in environmental systems; internal collaborations with the Center for Environmental Systems (CES) and the John Vossen Laboratory for Thin Film and Vacuum Technology; and external collaborations with the Universität Greifswald and the Institut für Niedertemperaturplasmaphysik (Institute for Low-Temperature Plasma Physics), Greifswald, Germany and the Universität Innsbruck, Austria.
More information about the research activities can be found on the individual web pages of the PEP faculty members.
Professor and Department Director