The ability to combine continuously tunable narrow-band terahertz (THz) generation that can access both the far-infrared and mid-infrared regimes with nanometer-scale spatial resolution is highly promising for identifying underlying light-matter interactions and realizing selective control of rotational or vibrational resonances in nanoparticles or molecules. Here, we report selective difference frequency generation with over 100 THz bandwidth via femtosecond optical pulse shaping. The THz emission is generated at nanoscale junctions at the interface of LaAlO3/SrTiO3 (LAO/STO) that is defined by conductive atomic force microscope lithography, with the potential to perform THz spectroscopy on individual nanoparticles or molecules. Numerical simulation of the time-domain signal facilitates the identification of components that contribute to the THz generation. This ultra-wide-bandwidth tunable nanoscale coherent THz source transforms the LAO/STO interface into a promising platform for integrated lab-on-chip optoelectronic devices with various functionalities.
Events Calendar View
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Applied Physics Seminar
Apr 5, 2019
Over 100-THz bandwidth selective difference frequency generation at LaAlO3/SrTiO3 nanojunctions
Guest: Prof. Jeremy Levy, Department of Physics and Astronomy, University of Pittsburgh. Pittsburgh Quantum Institute
Friday, April 5, 2019 12:20 pm - 1:20 pm
Location: CSP Conference Room (322) -
Departmental Colloquium
Apr 11, 2019
Quantum Sensing and Quantum Nanophotonics at Oak Ridge National Laboratory
Guest: Dr. Benjamin J. Lawrie, Quantum Information Science, Oak Ridge National Laboratory
Thursday, April 11, 2019 3:30 pm - 4:30 pm
Location: Physics Auditorium (202)The Heisenberg uncertainty relationship for the intensity and phase of light describes a fundamental shot noise limit that cannot be surpassed with classical states of light. Two- mode squeezed light sources exhibiting continuous variable entanglement allow us to reduce the noise floor in optically transduced sensors that utilize a single quadrature of the optical field, enabling greater signal to noise ratios than are possible in the best possible classical sensors. I will present some of our recent results demonstrating quantum enhanced sensitivity for applications ranging from magnetometry to plasmonic sensing to atomic force microscopy. I will also discuss some of our recent research efforts exploring quantum nanophotonics with plasmonic nanostructures and single photon emitters in low-dimensional materials. I will close with a brief perspective on the potential for hybrid quantum systems incorporating both continuous-variable squeezed light sources and nanophotonic discrete-variable quantum light sources.
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Applied Physics Seminar
Apr 12, 2019
Magnetic Resonance Imaging, Iron, and Machine Learning:from brain connectivity to stem cell tracking
Guest: Prof. Qun Zhao, Department of Physics & Astronomy, University of Georgia
Friday, April 12, 2019 12:00 pm - 1:00 pm
Location: CSP Conference Room (322)Iron is an essential trace element involved in a variety of biological mechanisms, such as oxygen transport, protein synthesis, and mitochondria respiration, in a living human or animal body. As a contrast agent, iron greatly improves MRI sensitivity in detecting iron-related biological process, including imaging of brain connectivity and tracking of stem cells. To improve mapping of brain connectivity, novel machine learning techniques are used to further enhance neuroimaging sensitivity.
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Observatory Open House
Apr 12, 2019
Observatory Viewing
Guest: Dr. Robin Shelton
Friday, April 12, 2019 9:30 pm - 10:30 pm
Location: UGA Observatory (4th floor Physics Building)There will be two shows with the first starting at 9:30pm and the second starting at 10:00pm
Because of the limited space in the dome, you must have a reservation to come to this showing. We will begin taking reservations for this viewing on Monday, April 1st at 2:00pm with our online reservation system.
The observatory is located at the top of the Physics building. To get to the observatory take the elevator to the 4th floor. A guide will meet you on the 4th floor and direct your group to the stairway that leads to the observatory. As the weather can be unpredictable, we might not know whether a viewing will be possible until shortly before the event begins.
If you need more information please call 706-542-2485.
Related: The UGA Observatory Schedule
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CSP Lunch Seminar
Apr 16, 2019
Reactive Scattering of HD by Hydrogen
Guest: Boyi Zhou, Dalian University of Technology, China
Tuesday, April 16, 2019 12:30 pm - 1:30 pm
Location: CSP Conference Room (322) -
CSP Lunch Seminar
Apr 23, 2019
Two birds with one stone: density-of-states-informed simulations and optimal parallel tempering
Guest: Dr. Thomas Vogel, Department of Physics, University of North Georgia
Tuesday, April 23, 2019 12:30 pm - 1:30 pm
Location: CSP Conference Room (322)
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