Side-Coupled Integrated Spaced Sequence of Resonators (SCISSOR)

Brief Description
This device, constructed of a sequence of micro-resonators coupled to an optical waveguide, demonstrates non-linearities and strong dispersive effects, which can be orders of magnitude greater than corresponding effects in traditional photonic devices.    The two effects, occurring in ultrashort distances in this novel structure, lead to exotic optical properties.  While the refractive index of conventional materials is in the range of 1 to 4, the group refractive index here can be 1000.

Can be used for a bio-detector.

Our resonators are fabricated in the form of a ring wave-guide or a whispering gallery mode of a disk, with up to 100 resonators of radius R = 2-5 mm, spaced at L = 10-20 mm.  Each optical resonator of the SCISSOR behaves like a Fabry-Perot cavity with a single output port.  It thus acts as an ``all-pass filter" which simply impresses a phase shift onto the transmitted field.  Since the light circulates many times in each resonator before passing to the next, the group velocity of propagation of a pulse of light through such a structure is greatly reduced.  Because the phase shift of the light wave interacting with each resonator depends sensitively on its de-tuning from the cavity resonance, the structure produces large and controllable dispersion.  Moreover, if the resonator is constructed of a material with a nonlinear optical response, the nonlinear phase shift will scale as the square of the finesse (free-spectral range divided by the resonance width) of the resonator, giving a significantly enhanced nonlinear optical response.  
Patent Information:
Title Country Patent No. Issued Date
An Apparatus with a Series of Resonator Structures Situated Near an Optical Waveguide for Manipulating Optical Pulses United States 7,245,801 7/17/2007
For Information, Contact:
Curtis Broadbent
Licensing Manager
University of Rochester
Robert Boyd
John Heebner