RESEARCH

Professor Sobolewski conducts his research at the University of Rochester Ultrafast Quantum Phenomena Laboratory. His interests are concentrated in the areas of solid-state and quantum electronics. This is a truly interdisciplinary effort, which overlaps such diverse disciplines as optics, micro and nano-electronics, cryogenics, materials science, condensed matter physics, and electrodynamics. His work is exploratory in nature, but it contains a strong applied flavor. The best example is his quest for the development of new, ultrafast devices based on integrated optical and solid-state technologies. (photo, Professor Sobolewski and his students in the Ultrafast Quantum Phenomena Laboratory, left to right: Dong Pan, PAS PhD 2009 student; Professor Sobolewski; Allen Cross, 5th-year ECE PhD student; Cheng Zhao, 4rth-year Materials Science PhD student; Charles Clarkson, 2nd-year ECE PhD student; and Jie Zhang, 3rd-year ECE PhD student)

Professor Sobolewski's current interests are extensive and build upon 30 years of intense research in these areas:

• Ultrafast quantum phenomena, nanoscience and spintronics, and information technology (2006-present)
• Ultrafast quantum phenomena, nanoscience, and information technology (2001-2005)
• Physics of ultrafast phenomena in solids (1996-2000)
• Superconducting digital electronics (1990-1996)
• Fabrication and high-frequency characterization of high-Tc superconducting thin films (1987-1990)
• Ultrafast phenomena in superconductors and semiconductors (1984-1987)
• Physics of superconductivity (1980-1984)
• Physics of the Josephson effects (1975-1980)

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Ballistic transport in 2-dimensional electron gas (2DEG) semiconductor heterostructures, including nanostructured ballistic deflection transistors and T-branch junctions. Characterization of magnetic nanostructures and spin injection in spintronic devices. Optical properties of single-crystal, wide-gap materials and semimagnetic and ferromagnetic semiconductors. Femtosecond, time-resolved studies of the dynamics of carriers, coherent phonons, and spins in semiconducting compounds. Single-photon detection and counting for telecom optical communications and quantum cryptography. Photon-number- and energy-resolving superconducting nanowire single-photon detectors. Terahertz frequency and sub-picosecond time-domain spectroscopy and imaging. The physics of high-temperature superconductivity.

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Single-photon detection and counting for quantum computing and quantum cryptography, deep-space optical communication, and ultraweak luminescence sensing. Femtosecond, time-resolved electro-optic and magneto-optic characterization of novel solid-state materials and quantum nanostructures and nanodevices. Optoelectronic transducers and modulators for input/output interfacing of ultrafast digital computing and routing processors. Dynamical phase transitions of "vortex matter" and the physics of vortex nucleation and propagation in high-Tc superconductors.

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Non-equilibrium phenomena in high-Tc superconductors. New device concepts for ultrafast electronics and optoelectronics. High performance superconducting optoelectronic devices and novel optoelectronic materials. Cryogenic and uncooled photodetectors and photomixers. Microwave photonics, terahertz pulse generation, and terahertz electronics and optoelectronics.

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Femtosecond solid-state lasers. Physics of superconductivity. Nonequilibrium effects in superconductors. Three-terminal devices for superconducting electronics. Microwave and millimeter wave devices. Fabrication and superconducting properties of high-Tc thin films.

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Low microwave loss high-Tc substrates. Physics of the Josephson effect. Ultrafast phenomena in superconductors and semiconductors. Superconducting microwave and digital electronics.

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Physics of superconductivity. Picosecond pulse propagation in dispersive transmission lines. Femtosecond laser systems. Dynamics of the switching process in Josephson junctions. Chaotic phenomena in Josephson junctions. Superconducting electronics.

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Nonequilibrium effects in superconductors. Dynamics of the intermediate state in non-equilibrium superconductors. Interaction of microwaves with Josephson junctions. Picosecond laser systems.

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Fabrication and microwave characterization of Josephson tunnel junctions. Millimeter-wave properties of superconductors. Polish national voltage standard based on the Josephson effect.

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