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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
Mar '15
Felix Izrailev  -  Monday, March 23, 2015
ABSTRACT: Abstract in pdf form is available here.
Apr '15
Alexander Greer  -  Monday, April 13, 2015
ABSTRACT: A phase-separated approach to reactive oxygen species that employs a liquid at a solid/liquid or solid/gas/liquid interface has been developed. Biphasic and triphasic photosensitizer systems contain regions that are controllably dry, partly wetted, and/or fully wetted. The talk will focus on a superhydrophobic surface fabricated by embedding silicon phthalocyanine sensitizing particles to specific locations on 3-D printed polydimethylsiloxane (PDMS) posts. In the presence of visible light and oxygen, singlet oxygen is formed on the superhydrophobic surface and reacts with an anthracene compound within a freestanding water droplet to produce an endoperoxide. The results indicate that the superhydrophobic sensitizer surface offers a unique system to study reactive singlet oxygen (1O2) transfer routes where a balance of gas and liquid contributions of 1O2 is tunable within the same superhydrophobic surface. Two microphotoreactor devices will also be described. In all, these systems physically isolate the photosensitizer from the solution which may be of practical importance for delivering singlet oxygen for water purification and medical devices.
1. D. Aebisher; D. Bartusik; Y. Liu; Y. Zhao; M. Barahman; Q. Xu; A. M. Lyons; A. Greer "Superhydrophobic Photosensitizers.  Mechanistic Studies of 1O2 Generation in the Plastron and Solid/Liquid Droplet Interface" J. Am. Chem. Soc. 2013, 135, 18990-18998.
2. Y. Zhao; Y. Liu; Q. Xu; M. Barahman; D. Bartusik; A. Greer; A. M. Lyons "Singlet Oxygen Generation on Porous Superhydrophobic Surfaces: Effect of Gas Flow and Sensitizer Wetting on Trapping Efficiency" J. Phys. Chem. A 2014, 118, 10364-10371.
3. D. Bartusik; D. Aebisher; A. M. Lyons; A. Greer "Bacterial Inactivation by a Singlet Oxygen Bubbler: Identifying Factors Controlling the Toxicity of 1O2 Bubbles" Environ. Sci. Technol. 2012, 46, 12098-12104.
4. D. Bartusik; D. Aebisher; B. Ghafari; A. M. Lyons; A. Greer  "Generating Singlet Oxygen Bubbles: A New Mechanism for Gas-Liquid Oxidations in Water" Langmuir 2012, 28, 3053-3060.
5. R. Choudhury; A. Greer "Synergism Between Airborne Singlet Oxygen and a Trisubstituted Olefin Sulfonate for the Inactivation of Bacteria" Langmuir 2014, 30, 3599-3605.
Apr '15
Mark Feuer  -  Monday, April 20, 2015
Space: is it the final frontier of photonics?
College of Staten Island of CUNY
ABSTRACT: Fiber optic networks underlie the Internet, massive data centers, and all of the other data-centric services of our modern economy.  The photonics community has sustained prodigious growth in that information flow by increasing the capacity of each optical fiber while simultaneously decreasing the cost per bit transmitted, but recent developments in coherent signaling have brought spectral efficiency close to its theoretical limits, and we are in need of a new revolution.

Space-division multiplexing (SDM), using novel fiber with multiple cores or multiple transverse modes in a large core, is being widely studied as the next wave of fiber optics.  Both multicore and multimode approaches have been successfully demonstrated in research, with the throughput of a single multicore fiber exceeding 1 Pb/s.  Nonetheless, the challenges facing SDM are numerous and daunting.  Multicore fibers are difficult to fabricate, multimode systems are subject to severe inter-modal crosstalk, and successful reduction in the cost per bit will require advanced functional integration of transceivers, amplifiers, mode multiplexers, and other elements of the photonic communications ecosystem.  For efficient network operation, flexible lightpath routing is essential, and SDM offers a number of ways to allocate lightpaths among wavelengths and spatial modes.  Finally, to assure economic viability at all stages of the SDM introduction, a deployment strategy that supports interworking of SDM and non-SDM sections is needed.

In this talk, I will review the past, present, and future of SDM research, and suggest some criteria for a successful commercial introduction of SDM technology. 
Apr '15
Emily Rice  -  Monday, April 27, 2015
Exploring exoplanets
College of Staten Island of CUNY
ABSTRACT: Exoplanets are everywhere in the Milky Way Galaxy, and likely the Universe, according to the most recent results from NASA's Kepler mission and other surveys. But how close are we to finding a habitable planet like Earth or to answering the eternal question, Are we alone in the Universe? I will explain how we came to understand the ubiquity of exoplanets, describe the complexity of the current census, and foreshadow what discoveries are likely to lie ahead in the coming years.
May '15
Misha Sumetsky  -  Monday, May 18, 2015
Nanophotonics of optical fibres
Aston Institute of Photonic Technologies, Aston University, UK
ABSTRACT: Nanoscale effects in photonic structures fabricated from pure optical fibres are reviewed. In contrast to those in plasmonics, these structures do not contain metal particles, wires, or films with nanoscale dimensions. Nevertheless, a nanoscale perturbation of the fibre radius can significantly alter their performance. I consider slow propagation of whispering gallery modes along the fibre surface. The axial propagation of these modes is so slow that they can be governed by extremely small nanoscale changes of the optical fibre radius. The described phenomenon is exploited in SNAP (Surface Nanoscale Axial Photonics), a new platform for fabrication of miniature super-low-loss photonic integrated circuits with unprecedented sub-angstrom precision. The SNAP theory and applications are reviewed.