Thesis Defense

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Events During the Week of May 1st through May 8th, 2022

Monday, May 2nd, 2022

The Influence of Cosmic Ray Transport on the Stability of Interstellar Gas
Time: 9:30 am
Place: B343 Sterling
Speaker: Evan Heintz, Physics PhD Graduate Student
Host: Ellen Zweibel
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Tuesday, May 3rd, 2022

No events scheduled

Wednesday, May 4th, 2022

No events scheduled

Thursday, May 5th, 2022

No events scheduled

Friday, May 6th, 2022

Metasurfaces for Mid-Infrared Applications
Time: 3:00 pm
Place: 5310 Chamberlin Hall
Speaker: Gregory Holdman, Physics PhD Graduate Student
Abstract: Metasurfaces are thin, periodically patterned subwavelength strcuture that exhibit optical properties not present in their constituent materials. The modes and spectral features can be used for applications often considered impossible with conventional optics such as perfect reflectivity, strong mode confinement, and other goals. In this talk, I will present work on two types of metasurfaces operating in the mid-infared. The first project studies the thermal stability of a "laser sail", a metasurface designed to be both highly reflective and have low absorption. This sail could one day be used as a spacecraft. With a GW-scale laser, the radiation pressure could accelerate the surface to a signicant fraction of the speed of light. The second project studies the possibility of integrating graphene into a metasurface exhibiting extremely narrow spectral features in order to modulate the frequency of the mode in situ. Such a device would find applications in free-space optical communication and trace gas sensing.
Host: Victor Brar
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