Xiaodong Yang

US Patent:

7346251, Mar 18, 2008

Filed:

Apr 18, 2006

Appl. No.:

11/405732

Inventors:

Ranojoy Bose - Flushing NY, US
Chee Wei Wong - New York NY, US
Xiaodong Yang - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

G02B 6/10

US Classification:

385129, 359332

Abstract:

Devices and methods of manufacturing; for emitting substantially white light using a photonic crystal are described. The photonic crystal has a lattice of air holes and is made from a substrate containing quantum dots. The substrate is etched with three defects that are optically coupled together so that each emits only certain frequencies of light. In combination, the defects can produce substantially white light. The parameters of the photonic crystal are dimensioned so as to cause the coupling between the defects to produce substantially white light.

US Patent:

7532656, May 12, 2009

Filed:

Feb 15, 2006

Appl. No.:

11/354725

Inventors:

Xiaodong Yang - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01S 3/083

US Classification:

372 94, 372 30, 372 66

Abstract:

Devices for generating a laser beam are disclosed. The devices include a silicon micro ring having at least one silicon optical waveguide disposed at a distance from the micro ring. The radius and the cross-sectional dimension of the microring, the cross-sectional dimension of the waveguide, and the distance between the micro ring and the waveguide are determined such that one or more pairs of whispering gallery mode resonant frequencies of the micro ring are separated by an optical phonon frequency of silicon. Methods of manufacturing a lasing device including a silicon micro ring coupled with a silicon waveguide are also disclosed.

US Patent:

7869470, Jan 11, 2011

Filed:

Aug 31, 2006

Appl. No.:

12/065406

Inventors:

Chee Wei Wong - New York NY, US
James F. McMillan - New York NY, US
Xiaodong Yang - New York NY, US
Richard Osgood, Jr. - Chappaqua NY, US
Jerry Dadap - Red Bank NJ, US
Nicolae C. Panoiu - Barnet, GB

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01S 3/30

US Classification:

372 3

Abstract:

Devices and methods for providing stimulated Raman lasing are provided. In some embodiments, devices include a photonic crystal that includes a layer of silicon having a lattice of holes and a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing. In some embodiments, methods include forming a layer of silicon, and etching the layer of silicon to form a lattice of holes with a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing.

US Patent:

8017419, Sep 13, 2011

Filed:

Feb 25, 2009

Appl. No.:

12/392634

Inventors:

Xiaodong Yang - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01L 21/00
H01S 3/083

US Classification:

438 31, 438 29, 438 32, 372 94

Abstract:

Methods of manufacturing a lasing device are provided by some embodiments, the methods including: creating a silicon micro ring with a predetermined radius and a predetermined first cross-sectional dimension; creating a silicon waveguide with a predetermined second cross-sectional dimension, the silicon waveguide spaced from the silicon micro ring by a predetermined distance; and wherein the predetermined distance, the predetermined radius, the predetermined first cross-sectional dimension, and the predetermined second cross-sectional dimension are determined so that at least one first whispering gallery mode resonant frequency of the silicon micro ring and at least one second whispering gallery mode resonant frequency of the silicon micro ring are separated by an optical phonon frequency of silicon.

US Patent:

8287642, Oct 16, 2012

Filed:

Nov 17, 2010

Appl. No.:

12/948706

Inventors:

Chee Wei Wong - New York NY, US
James F. McMillan - New York NY, US
Xiaodong Yang - New York NY, US
Richard Osgood, Jr. - Chappaqua NY, US
Jerry Dadap - Red Bank NJ, US
Nicolae Panoiu - Bronx NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

C30B 29/06

US Classification:

117 2, 117 3, 117 8, 117 9, 117935

Abstract:

Devices and methods for providing stimulated Raman lasing are provided. In some embodiments, devices include a photonic crystal that includes a layer of silicon having a lattice of holes and a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing. In some embodiments, methods include forming a layer of silicon, and etching the layer of silicon to form a lattice of holes with a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing.

US Patent:

8207002, Jun 26, 2012

Filed:

Aug 2, 2011

Appl. No.:

13/196674

Inventors:

Xiaodong Yang - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

The Trustees Of Columbia University In The City Of New York - New York NY

International Classification:

H01L 21/00
H01S 3/083

US Classification:

438 31, 438 29, 372 64, 372 30

Abstract:

Devices for generating a laser beam are disclosed. The devices include a silicon micro ring having at least one silicon optical waveguide disposed at a distance from the micro ring. The radius and the cross-sectional dimension of the micro ring, the cross-sectional dimension of the waveguide, and the distance between the micro ring and the waveguide are determined such that one or more pairs of whispering gallery mode resonant frequencies of the micro ring are separated by an optical phonon frequency of silicon. Methods of manufacturing a lasing device including a silicon micro ring coupled with a silicon waveguide are also disclosed.

US Patent:

20080315177, Dec 25, 2008

Filed:

Jan 15, 2008

Appl. No.:

12/014243

Inventors:

Ranojoy BOSE - Flushing NY, US
Chee Wei WONG - New York NY, US
Xiaodong YANG - New York NY, US

Assignee:

THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK - New York NY

International Classification:

H01L 33/00
H01L 21/02

US Classification:

257 13, 438 31, 257E21002, 257E33008

Abstract:

Devices and methods of manufacturing; for emitting substantially white light using a photonic crystal are described. The photonic crystal has a lattice of air holes and is made from a substrate containing quantum dots. The substrate is etched with three defects that are optically coupled together so that each emits only certain frequencies of light. In combination, the defects can produce substantially white light. The parameters of the photonic crystal are dimensioned so as to cause the coupling between the defects to produce substantially white light.

US Patent:

20100270481, Oct 28, 2010

Filed:

Jun 16, 2008

Appl. No.:

12/664627

Inventors:

Chee Wei Wong - New York NY, US
Xiaodong Yang - New York NY, US
Charlton Chen - New York NY, US
Chad Husko - New York NY, US

Assignee:

Columbia University - New York NY

International Classification:

G21K 5/02
G02B 6/10
B05D 5/06

US Classification:

2505031, 385131, 427162, 977890, 977880, 977834, 977774, 977902

Abstract:

Some embodiments of the disclosed subject matter provide systems, devices, and methods for tuning resonant wavelengths of an optical resonator. Some embodiments of the disclosed subject matter provide systems, devices, and methods for tuning dispersion properties of photonic crystal waveguides. In some embodiments, methods for tuning a resonant wavelength of an optical resonator are provided, the methods including: providing an optical resonator having a surface; determining an initial resonant wavelength emitted by the optical resonator in response to an electromagnetic radiation input; determining a number of layers of dielectric material based on a difference between the initial resonant wavelength and a target resonant wavelength and a predetermined tuning characteristic; and applying the determined number of layers of dielectric material to the surface of the optical resonator to tune the initial resonant wavelength to a tuned resonant wavelength.