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OSA Student Chapter Meeting


MAIN TALK
SPEAKER: Anton Shutov
TITLE: Surface Enhanced Coherent Raman Scattering spectroscopy of pyridine-ethanol mixtures and Molybdenum Disulfide (MoS2)
ABSTRACT:
Surface Enhanced Raman Scattering spectroscopy (SERS) has been extensively developed in recent 30 years. Majority of the studied systems include metal (silver, gold, aluminum) nanoparticles for enhancement of the Raman signal. However, several disadvantages of metallic substrates limit a real-world application of SERS, so many researches are focused on studying SERS with 2d materials, such as Molybdenum Disulfide (MoS2). MoS2 can be deposited as a single layer on a substrate to generate SERS signal. Alternatively, a solution containing MoS2 mono- and few- layered flakes can be combined with the molecules of interest. I will describe how one can even further improve SERS by introducing coherence in the system, i.e. by performing Coherent anti-Stokes Raman Scattering (CARS) spectroscopy. Moreover, I will show how the adding of very small amounts of MoS2 (4.4 g/cm3) to the liquid mixture of pyridine and ethanol enhances the Raman signal.





OPTICS NEWS
SPEAKER: Ivan Cojocaru
TITLE: Room-temperature spontaneous superradiance from single diamond nanocrystals
ABSTRACT:
Superradiance (SR) is a cooperative phenomenon which occurs when an ensemble of quantum emitters couples collectively to a mode of the electromagnetic field as a single, massive dipole that radiates photons at an enhanced rate. Previous studies on solid-state systems either reported SR from sizeable crystals with at least one spatial dimension much larger than the wavelength of the light and/or only close to liquid-helium temperatures. Here, we report the observation of room-temperature superradiance from single, highly luminescent diamond nanocrystals with spatial dimensions much smaller than the wavelength of light.




Thursday, November 28, 2017
IQSE 578, 12:00 noon
Mitchell Physics Building


Department of Physics and Astronomy
Institute for Quantum Science and Engineering
Texas A&M University

(Pizza lunch as usual. Newcomers welcome!)

Host: Sasha Zhdanova