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Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

Oscar Wilde

Colloquia

Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
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19
Sep '22
In-person
+ Online
Neurophotonics Center, Department of Biomedical Engineering, Boston University
Xiaojun Cheng
Light scattering in dynamic brain tissue: from theoretical exploration to ‎human brain functional imaging
Download PDF SB B326 & Zoom
Abstract:

The brain is the most complex organ containing billions of neurons working in harmony to generate behavior. Understanding how the brain of humans and other species works in health and disease requires imaging techniques that can access structural and functional information across various spatial resolution scales. Optical imaging is a promising and, in many cases, the only technique that resolves the structural and functional information on the cellular or sub-cellular level. It can also be utilized to monitor brain functions non-invasively for human measurement. But light is multiply scattered in the brain. Understanding how light scatters within the brain is crucial for developing imaging modalities in many microscopy systems, as well as in probes of diffused light that extract information about the tissue from scattered light.

In this talk, I will introduce our studies of light propagation in scattering biological tissue. I will then discuss recent modeling and experimental work on non-invasive measurements of human brain function in which we analyze and compare the performance of diffuse optical methods including functional near-infrared spectroscopy (fNIRS), diffuse correlation spectroscopy (DCS), and its time-domain variant (TD-DCS), and speckle contrast optical spectroscopy (SCOS). This paves the way for the development of low-cost, high-performance optical techniques with applications to routinely monitor brain states at the bedside and brain-computer interfaces.

3
Oct '22
In-person
+ Online
Rutgers University
Srivatsan Chakram
Quantum information and simulations with multimode superconducting systems
Abstract:
Quantum information science promises to revolutionize technologies in computing, communication, and sensing. There has been dramatic progress on superconducting quantum systems, which are poised to implement medium-scale quantum simulations and algorithms for quantum chemistry, and quantum optimization.  However, superconducting processors are still limited in terms of coherence and connectivity, and expensive in terms of hardware and control resources. Current qubit error rates require large numbers of physical qubits (10k - 1 million) for implementing quantum error correction.  Can we significantly reduce the number of physical qubits and the hardware overhead required for fault-tolerant quantum computing? We discuss the prospects of addressing these challenges through new hardware-efficient architectures for quantum computing, that combine superconducting circuits with ultra-low-loss multimode microwave resonators. We will discuss new multimode control schemes, and applications of multimode cQED systems for bosonic quantum error correction and realizing analog quantum simulators that leverage the single-site (cavity mode) and single-particle (microwave photon) control offered by the toolbox of quantum optics. 
31
Oct '22
In-person
+ Online
Tel Aviv University
Tal Carmon
Introducing new phases of matter to microphotonics
Abstract:
We design, fabricate, and experimentally characterize optical microresonators made of solids, liquids and plasma.
Liquid resonators permit a new type of water-wave lasers, while plasma micro-resonators allow novel electro-optical interconnects.
14
Nov '22
In-person
+ Online
Hunter College ‎of CUNY
Godfrey Gumbs
Pseudo-relativistic quantum physics and graphene
Abstract:
Femtosecond and subfemtosecond time scales typically rule electron dynamics at ‎conductor surfaces. Recent advances in experimental techniques allow the ‎experimental study of such dynamics. In this talk we shall analyze electron dynamics ‎at the surfaces of nanostructures with emphasis on screening,  chirality and spin ‎dependence of charge transfer, plasmonics, dipolar excitons in double layer graphene ‎and the associated superfluidity and Bose-Einstein condensation. We will discuss the ‎effect of energy gaps on possible “Veselago lenses” for completely flat grapheme ‎sheets. We will also discuss how plasmon instabilities may be exploited for ‎tunable  radiation generation which may be employed in detectors.‎

 
5
Dec '22
Next Event
In-person
+ Online
Penn State, Scranton
Agnes Kim
White dwarf asteroseismology supported by space missions
This talk is accessible via Zoom or use
meeting ID 829 2687 2594 and passcode 866995 to join
Abstract:
Our Sun, and the vast majority of stars, end their evolution as white dwarfs, objects that pack the mass of the sun in a volume similar to that of the Earth. Some white dwarfs exhibit periodic variations in their light output, which allow us to study their interior. This is the field of white dwarf asteroseismology. After an introduction to asteroseismology, we will focus on how space missions such as Kepler, TESS, and Gaia have allowed us to make progress in the study of white dwarf stars.