BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-8670
DTSTART:20240313T180000Z
DTEND:20240313T190000Z
DTSTAMP:20260413T205317Z
LAST-MODIFIED:20240306T232823Z
LOCATION:2540 Engineering Hall
SUMMARY:Optical relaxation dynamics of nanocavity-coupled erbium ensem
 bles\, Wisconsin Quantum Institute\, Dr. Alan Dibos\, Argonne National
  Laboratory
DESCRIPTION:Tailoring the interaction between optical emitters and the
 ir electromagnetic environment is of both fundamental scientific inter
 est and practical relevance for applications such as quantum communica
 tion and quantum information processing. By tuning the photonic densit
 y of states\, one can drastically modify the emission properties of th
 ese emitters\, a phenomenon that underpins the thriving research area 
 of cavity quantum electrodynamics. In this talk\, we will first presen
 t our rare earth doped nanocavity platform that is being pursued for f
 uture quantum optical memory devices operating at cryogenic temperatur
 es. Our spin qubit system consists of Er 3+  ions with a natural optic
 al transition in the telecom (~1520 nm)\, but the long optical lifetim
 e of these ions (order of milliseconds) necessitates the use of an opt
 ical cavity to greatly enhance the emission rate. More specifically\, 
 we grow thin film Er 3+ -doped titanium dioxide (TiO 2 ) atop silicon-
 on-insulator wafers and fabricate small mode volume photonic crystal c
 avities via etching through both the TiO 2  and Si device layers. We h
 ave thus far demonstrated that when the optical cavity is resonant wit
 h optical transition of the Er 3+ ions\, the optical lifetime can show
  an enhancement (Purcell factor) up to several hundred [1]. However\, 
 in addition to quantum communication applications\, we can use the lon
 g optical lifetimes of rare-earth ions for more fundamental optical de
 cay modification experiments [2]. For our system\, the ensemble of Er 
 3+  emitters that couples to the cavity exhibit a much broader inhomog
 eneous linewidth than the cavity. When the optical cavity is tuned thr
 ough the Er 3+  inhomogeneous distribution\, the resultant Purcell fac
 tor exhibits an anomalous slowing of the decay when the cavity is reso
 nant with the center of the distribution. We will examine the experime
 ntal Purcell factor dependence on resonant laser pump power\, as well 
 as the spectral dependence of the PLE emission. We will discuss our at
 tempts to capture qualitative aspects of this decay rate suppression u
 sing a semi-classical model of non-interacting emitters mediated by a 
 common cavity. Finally\, we will discuss a recent material synthesis d
 evelopment to make our Er 3+ :TiO 2  system potentially more scalable 
 for foundry- level deployment [3].<br>
\n<br>
\n[1] A. M. Dibos et al.
 \, “Purcell enhancement of erbium ions in TiO 2  on silicon nanocavi
 ties\,” Nano Lett. 22\,<br>
\n6530 (2022).<br>
\n[2] M. T. Solomon e
 t al.  “Anomalous Purcell decay of strongly driven inhomogeneous emi
 tters coupled to<br>
\na cavity.” arXiv\, DOI: 10.48550/arXiv.2309.1
 6641 (2023).<br>
\n[3] C. Ji et al. “Nanocavity-mediated Purcell enh
 ancement of Er in TiO 2  thin films grown via atomic layer<br>
\ndepos
 ition.” arXiv\, DOI: 10.48550/arXiv.2309.13490 (2023). Accepted in A
 CS Nano.<br>
\n<br>
\nhttps://engineering.wisc.edu/event/ece-seminar-w
 ith-dr-alan-dibos-argonne-national-laboratory/
\n<br>
\n
URL:https://www.physics.wisc.edu/events/?id=8670
END:VEVENT
END:VCALENDAR