Dynamic manipulation of light has received considerable attention in recent years. The process of an optical signal undergoing a transition between two modes of a photonic structure is referred to as a photonic transition. We show that a signal wave interacting with a free carrier front in a slow light waveguide experiences indirect photonic transitions leading to reflection from the moving front. Theory and experimental results are presented. The front induced dynamic frequency conversion is also compared to the frequency shifting based on other nonlinear effects like cross-phase modulation and four wave mixing.
The process of an optical signal undergoing a transition between two modes of a photonic structure is referred to as a photonic transition. We show that a signal wave interacting with a free carrier front in a slow light waveguide experiences indirect photonic transitions leading to transmission or reflection from the moving front. Theory and experimental results are presented. The front induced dynamic frequency conversion is also compared to the frequency shifting based on other nonlinear effects like cross-phase modulation and four wave mixing.
We present a concept for a circulator that has the same bandwidth efficiency as a photonic crystal circulator but which relies on a ring resonator and thereby is experimentally much easier to realize. We achieve this by side coupling three waveguides to the ring resonator. The desired standing wave pattern which recreates the photonic crystal type circulator spectrum is realized by exciting both the clockwise and counter-clockwise traveling wave through a Bragg reflector.
We present a setup to measure the nonreciprocal magneto-optical phase shift in air and polymer cladded silicon on
insulator waveguides. A high sensitivity could be achieved for the setup sufficient to determine the effect produced by
silicon and silica. A silicon waveguide covered with a Fe3O4 nanoparticle containing polymer shows an amplitude
modulation resulting from Faraday ellipticity which is of the same order of magnitude as the Faraday effect in silicon.
We further present the theoretical concept of an optical isolator based on resonance splitting in a silicon ring resonator
covered with a magneto-optical polymer cladding. A polymer
magneto-optical cladding causing a 0.01 amplitude of the
offdiagonal element of the dielectric tensor is assumed. It is shown that the derived resonance splitting of the clockwise
and counterclockwise modes increases for smaller ring radii. For the ring with a radius of approximately 1.5 μm, a 29
GHz splitting is demonstrated. An integrated optical isolator with a 10μm geometrical footprint is proposed based on a
critically coupled ring resonator.
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