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Selex Sistemi Integrati S.p.a.

Marco Centini

Michael Scalora

Mark J Bloemer

Concita Sibilia

Giuseppe D'Aguanno

Roberto Cingolani

Fabio Antonio Bovino

Maria Cristina Larciprete

Maurizio Giardina

Adriana Passaseo

Alessandro Belardini

Mario Bertolotti

Vittorianna Tasco

Optical logic gate having a second-harmonic generator element that receives a first and a second optical input signal respectively having a first and a second angular frequency and respectively having a first and a second polarization, and which provides a second-harmonic optical signal having a third angular frequency and a third polarization. The third angular frequency is equal to the sum of the first and the second angular frequency. The third polarization is a function of the first and the second polarization. The second-harmonic generator element includes a second-harmonic generator layer in a material having a non-null second-order optical tensor.

Optical logic gate

A photonic band gap (PBG) device is provided for frequency up and/or down-converting first and second photonic signals incident on the device to produce a down-converted output photonic signal. When the first and second incident photonic signals have respective first and second frequencies &ohgr; and &ohgr; , the down-converted photonic signal has a third frequency &ohgr; &equals;&ohgr; &minus;&ohgr; . When the first incident field has a frequency &ohgr; , the first up-converted photonic signal has a second frequency &ohgr; . The second up-converted photonic signal has a third frequency &ohgr; &equals;&ohgr; &plus;&ohgr; . Thus, the PBG device can be used to generate coherent near- and mid-IR signals by frequency down-converting photonic signals from readily available photonic signal sources, or red, blue, and ultraviolet signals by up-converting the same readily available photonic signal sources.

Photonic signal frequency up and down-conversion using a photonic band gap structure

A device is provided for generating a photonic signal having a phase different from an input photonic signal that is incident on the device. The input photonic signal has an signal frequency, signal bandwidth, and a signal intensity. The device comprises a plurality of material layers. The material layers are arranged such that the device exhibits a photonic band gap structure. The photonic band gap structure exhibits a transmission band edge that corresponds to the input photonic signal frequency. A second photonic signal is generated at a second photonic frequency preferably close to a second band edge. The interaction of the input photonic signal with the second photonic signal generates a phase shift of order &pgr; for relatively small input intensities.

Efficient non-linear phase shifting using a photonic band gap structure

Non-linear reflectivity and non-linear transmissivity of a first photonic signal incident on a photonic band gap (PBG) structure are controlled by applying a second photonic signal to the PBG structure while the first photonic signal is incident on the PBG structure. The first and second photonic signals have respective frequencies near a low frequency, first order band gap edge and a high frequency, second order band gap edge resonance peak of the PBG structure. The first photonic signal undergoes enhanced non-linear gain near the band gap edges when a predetermined phase difference is imposed between the first and second photonic signals, resulting in dramatic reflectivity and transmissivity changes for a band gap structure of only a few microns in length.

Photonic signal reflectivity and transmissivity control using a photonic band gap structure

Growing community of inventors

San Benedetto del Tronto (AP), Italy

Marco Centini