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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8258
DTSTART:20230501T150000Z
DTEND:20230501T170000Z
DTSTAMP:20260414T051816Z
LAST-MODIFIED:20230417T144126Z
LOCATION:4274 Chamberlin
SUMMARY:Nanoscale Enhancement of Dipole Emission: Modeling Multi-Photo
 n Effects and Microwave Emission from Small Josephson Junctions\, Grad
 uate Program Event\, Colin Whisler\, Physics Graduate Student
DESCRIPTION:The classical electric dipole acts as a source of electrom
 agnetic radiation\, and the power emitted can be modified significantl
 y by optimizing the emitter's environment. This topic has numerous app
 lications\, as the electric dipole serves as an excellent representati
 on for processes such as fluorescence from an atomic emitter in an exc
 ited state or radiation from a Josephson junction in the AC Josephson 
 effect. Finite difference time domain (FDTD) simulations can provide p
 owerful tools for analyzing these phenomena in arbitrary geometries. T
 his dissertation first calculates the enhancement of two-photon sponta
 neous emission (2PSE) from trivalent and divalent rare earth ions in p
 roximity to graphene and graphene nanoribbons for achievable experimen
 tal conditions using a combination of FDTD simulations and direct comp
 utation of transition rates between energy levels in rare earths. The 
 second portion of the dissertation considers the enhancement of dipole
  emission in a nanoscale gap between an atomically sharp conducting ti
 p and a metallic surface. This serves as a model for Josephson junctio
 n spectroscopy\, in which the tunneling of Cooper pairs releases local
  microwaves at bias-dependent frequencies that can be absorbed by near
 by molecules\, causing DC current to flow. Our results suggest intrigu
 ing possibilities for new applications in quantum technology while als
 o discussing the challenges that still must be overcome.
URL:https://www.physics.wisc.edu/events/?id=8258
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