Refreshments: 3:30, talk 4:00 - 5:00 p.m.

2018

Nov
14
2018
Neutrino Physics and the PROSPECT Experiment

Neutrinos, the most ghostly of Standard Model particles, were first detected by Clyde Cowan and Frederick Reines in 1956. Although these particles are included in the Standard Model, their properties such as mass and mixing parameters are not predicted and must be measured. Ever since their discovery, physicists have been trying to piece together a comprehensive understanding of the neutrino and over the past 6 decades a nearly complete picture has emerged. However, there are still some undetermined parameters as well as phenomena that have resisted explanation. One of these unexplained phenomena that has arisen rather recently termed the "reactor antineutrino anomaly" is the deficit in the measured flux of antineutrinos from nuclear reactors relative to the expected flux from calculation. Furthermore, the energy spectrum of reactor antineutrinos from recent experiments deviates from the calculated shape in the region of 5-7 MeV antineutrino energy. PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, currently taking data at Oak Ridge National Lab, aims to shed some light on these anomalies by measuring the flux a few meters from the core of a highly enriched uranium (HEU) research reactor. In so doing, many obstacles had to be overcome, not the least of which was designing a detector that could isolate antineutrino events from huge backgrounds inherent in the environment at the surface of the Earth and next to a reactor.  In this talk, I will give a brief history of neutrinos and how their properties were determined highlighting some key experiments. Special emphasis will be given to the PROSPECT experiment with recent data and analysis shown.

Low Center for Industrial Innovation (CII) 3051 4:00 pm

Oct
24
2018
Yung Joon Jung, Northeastern University
Low Center for Industrial Innovation (CII) 3051 4:00 pm

Oct
17
2018
The Robert Resnick Lecture
Stephon Alexander, Brown University
Sage 3303 4:00 pm

Oct
3
2018
Integrated Slow-Light Silicon Photonic Devices and Systems for RF Photonic and Optical Computing Applications

Significant research and development in the field of Si Photonics have been done in the past two decades leading to the worldwide establishment of Si Photonics foundry services. The technology advancement includes hybrid integration of III-V laser diodes on Si platform, micro-ring or disk resonators, integrated PN junction based Mach-Zehnder (MZ) light modulators, SiGe on Si photodetectors, SiN low-loss waveguides, integrated optical delay line, array waveguide gratings etc. In my group, the current focus of research is slow-light Bragg grating rib waveguides and slot waveguides on Si substrate. Slow-light waveguide has enhanced light-matter interaction so allowing significant size reduction in active photonic devices such as MZ light modulators. The MZ modulator is a basic building block for a large array of tunable optical interference units for the on-chip optical neuromorphic computing application in which the MZ interferometer serves as an arbitrary unitary matrix. The passive slow-light waveguide is also a key element for chip scale photonic system integration in many application areas. For example, the slow-light Bragg grating waveguide has been used to construct tunable optical delay lines for beamforming in phased array antennas. For on-chip optical reservoir computing, a dispersive Bragg grating is a critical element in obtaining nanoseconds of true-time delay for storage of memories.

Low Center for Industrial Innovation (CII) 3051 4:00 pm

Sep
19
2018
Yiping Zhao, University of Georgia
Low Center for Industrial Innovation (CII) 3051 4:00 pm

Sep
12
2018
Michael Agiorgousis, RPI
Low Center for Industrial Innovation (CII) 3051 4:00 pm

Apr
25
2018
Marc Miskin, Cornell University

Apr
11
2018
Steven G. Louie, University of California at Berkeley and Lawrence Berkeley National Lab

Mar
21
2018
J. Michael Kosterlitz, Brown University

Feb
28
2018
Guy Consolmagno, Vatican Observatory

Feb
21
2018

Feb
14
2018

Jan
31
2018

Jan
24
2018
Boleslaw Szymanski, Rensselaer Polytechnic Institute