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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2807
DTSTART:20121101T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T034603Z
LAST-MODIFIED:20121015T175519Z
LOCATION:5310 Chamberlin
SUMMARY:Nonlinear and nonreciprocal effects in magnetic garnet films\,
  R. G. Herb Condensed Matter Seminar\, Pradeep Kumar\, Michigan Techno
 logical University
DESCRIPTION:The talk consists of two parts. In the first part\, the la
 ttice-imperfection and compositional origins of the nonlinear optical 
 response in RF sputter deposited magnetic garnet thin films are discus
 sed based on experimental findings. The experimental results establish
  that lattice mismatch strain drives the second harmonic signal in bis
 muth-substituted yttrium iron garnet (Bi:YIG) films\, in agreement wit
 h theoretical predictions. This study also elaborates on the influence
  of the filmaEuroTMs constitutive elements and finds the nonlinear res
 ponse to increase with yttrium concentration.  <br>
\n<br>
\nThe secon
 d part of the talk addresses a novel effect\, namely nonreciprocal opt
 ical Bloch oscillation\, recently proposed and developed by us [1\, 2]
 . Our work has established a comprehensive theoretical basis for the i
 mplementation of nonreciprocal and unidirectional optical Bloch oscill
 ations. The model system we developed consists of one-dimensional wave
 guide arrays in silicon-on-insulator platforms with magnetic garnet co
 ver layers. An optical force is introduced into the array through geom
 etrical design\, pushing the beam sideways. Laterally displaced photon
 s are periodically returned to a central guide by photonic-crystal act
 ion\, producing beam revival in the central guide. The unidirectional 
 Bloch oscillation effect allows the implementation of on-chip optical 
 isolation\, a technologically important function in photonic integrate
 d circuits [3]. <br>
\n<br>
\n[1] M. Levy and P. Kumar\, Optics Letter
 s Vol. 35\, Issue 18\, page 3147-3149 (2010)  <br>
\n[2] P. Kumar and 
 M. Levy\, Optics Letters Vol. 36\, Issue 22\, page 4359-4361 (2011)  <
 br>
\n[3] P. Kumar and M. Levy\, Optics Letters Vol. 37\, Issue 18\, p
 age 3762-3764 (2012) <br>
\n
URL:https://www.physics.wisc.edu/events/?id=2807
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