Azriel Z Genack, 8266 W 94Th St UNIT 5E, New York, NY 10025

6396859, May 28, 2002

Feb 4, 2000

09/498521

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

H01S 314

372 39, 372 43, 372 54, 372 98

A defect causing a localized state is induced in a chiral structure composed of multiple chiral elements by twisting one element of the chiral structure with respect to the other elements along a common longitudinal axis such that directors of the element molecular layers that are in contact with one another are disposed at a particular âtwistâ angle therebetween, the twist angle being greater than a shift angle between directors of consecutive layers. The chiral twist structure may be utilized in a variety of applications such as filters, lasers and detectors. The defect caused by the twist may be made tunable by providing a tuning device for ly rotating one or more of the chiral elements with respect to one another to vary the twist angle and thus vary the position of the induced defect within a photonic stop band. Tunable defects may be advantageously utilized to construct wavelength tunable chiral filters, detectors and lasers.

6404789, Jun 11, 2002

Dec 21, 1999

09/468148

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

H01S 314

372 39, 372 43, 372 27, 372 54

A chiral laser apparatus comprises a layered structure configured to produce a photonic stop band, the layered structure including a upper chiral material layer, a middle excitable light-emitting layer, and a lower chiral material layer and an excitation source that, when applied to the layered structure, causes the middle light-emitting layer to emit electromagnetic radiation, such that polarized lasing at a lasing wavelength occurs in a direction perpendicular to the layered structure. The middle light-emitting layer may be configured to produce a defect such that lasing advantageously occurs at a wavelength corresponding to a localized photonic state within the photonic stop band. The excitation source may be an electrical power source connected to the layered structure via two or more electrodes. In another embodiment of the invention, the layered structure is replaced with a homogeneous chiral material doped with a light-emitting material. Excitation sufficient to cause lasing is provided by the electrical power source via a pair of electrodes connected to the chiral material.

6411635, Jun 25, 2002

Mar 31, 2000

09/539823

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

H01S 314

372 39, 392 69, 392 20

The present invention advantageously enables single-mode lasing at higher pump power and further enables general reduction of the lasing radiation bandwidth. This is accomplished by producing an appropriate spatial gain distribution inside the laser medium. The present invention further enables advantageous selection of a particular photonic mode for lasing at that mode in a periodic laser by varying spatial gain distribution within the periodic laser medium. Photonic mode selection by varying gain distribution within the laser medium is accomplished in accordance with various embodiments of the present invention.

6671293, Dec 30, 2003

Nov 19, 2002

10/299651

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

H01S 330

372 6, 372 39, 372 72

A chiral fiber laser implemented in a fiber Bragg grating mimicking the advantageous optical properties of a cholesteric liquid crystal structure is provided. The dopant, the pitch, the core cross section and dimensions thereof, of the inventive chiral fiber laser as well as the core and cladding materials used in construction thereof, may be advantageously selected and configured to enable the inventive chiral fiber laser to produce lasing at a desirable wavelength. In another embodiment of the inventive chiral fiber laser, a tunable defect is introduced to provide tunable lasing corresponding to the wavelength at the defect mode. Multiple embodiments using coupled fiber optical pumping as well as direct optical pumping for excitation of the inventive chiral fiber laser are provided.

6678297, Jan 13, 2004

Mar 20, 2001

09/812457

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

H01S 500

372 43, 372 39, 372 98, 372 54, 257 40

The inventive chiral laser achieves lasing by placing an electro-luminescent emitting layer with quarter wave plate properties and a layer of cholesteric liquid crystal (CLC) between two electrodes. The electrode connected to the emitting layer is highly reflective and serves as a source of electrons, while the second electrode, connected to the hole-transporting CLC, serves as a source of holes. The recombination of electrons and holes in the emitting layer produces luminescence. If a right handed CLC structure is used, then right circularly polarized emission is reflected from the CLC as right circularly polarized light, and then converted to linear polarized light by passing through quarter wave plate emitting layer. It is then reflected by the electrode and converted again into the right circularly polarized light in a second pass through the quarter wave plate emitting layer. The emitted and reflected light emissions are incrementally amplified on each pass through the emitting layer and thus a laser cavity is formed.

6721469, Apr 13, 2004

Dec 6, 2002

10/313450

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

G02B 600

385 11, 385 24, 385 10, 385123

A chiral in-fiber tunable polarizer implemented in a chiral fiber structure is provided. The chiral fiber is selected with a predetermined handedness and scatters (by reflecting, coupling into the fiber core or otherwise) the circularly polarized light matching its handedness while transmitting circularly polarized light of opposite handedness. By combining the chiral fiber with another fiber component having a non-cylindrical core, the inventive apparatus produces a linearly polarized wave with a predetermined orientation. The orientation may be adjusted by rotating the fiber component around its central axis. The chiral fiber structure may be configured as a long period chiral fiber grating. Optionally, the chiral fiber structure may be configured with a variable pitch along its length, such as a chirped fiber grating, an apodized fiber grating, or a set of multiple sequential chiral polarizer elements with different pitches. This variable pitch arrangement results in output light having a configurable polarization spectrum of a predetermined shape.

6741631, May 25, 2004

Mar 14, 2003

10/389616

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clinton NJ

H01S 308

372102, 372 6, 385 37

A apodized chiral fiber grating consists of a chiral fiber with a variable effective grating strength along different regions of its length, such that the effective grating strength gradually increases from one end of the chiral fiber until a peak effective grating strength is reached and then gradually decreases at the same rate towards the other end of the fiber. Optionally, the effective grating strength remains stable for a portion of the fiber before decreasing. Other forms of grating strength variations in different regions of the chiral fiber are also contemplated. The effective grating strength variation produces an apodized chiral fiber that possesses desirable characteristics that greatly reduce or eliminate the sidelobes in the fibers spectral response. The effective grating strength is varied by modulating the pitch of the apodized chiral fiber along different regions of its length in accordance with a mathematical expression, such as for example: linear, polynomial, sinusoidal or quasi-sinusoidal function. Advantageously, the inventive apodized chiral fiber is customizable to any application by selectively controlling the pitch variation along the different regions.

6744943, Jun 1, 2004

Dec 12, 2001

10/017963

Victor Ilich Kopp - Flushing NY
Azriel Zelig Genack - New York NY

Chiral Photonics, Inc. - Clifton NJ

G02B 628

385 24, 359629, 398 65, 398 84, 398 85

An add-drop filter, utilizing chiral elements, that enables a new signal to be added at a particular vacuum wavelength â to a fiber optic line carrying n signal channels over a band of wavelengths encompassing. . . , ,. . . , while an existing signal, , is simultaneously dropped from the signal group.