Michael J Marchywka

US Patent:

6534125, Mar 18, 2003

Filed:

Jul 24, 2000

Appl. No.:

09/624231

Inventors:

Michael J. Marchywka - Lanham MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B05D 302

US Classification:

4273977, 42725537

Abstract:

An article includes a diamond substrate which is securely adhered to a robust layer of silica layer that cannot be scratched by a tungsten probe or delaminated from the diamond substrate by pulling on a gold wire secured to the silica layer. This aricle can be made by electrochemically cleaning the diamond substrate to remove non-diamond carbon adhering thereto, depositing a fragile layer of silica layer which weakly bonds to the cleaned diamond, and annealing the fragile silica layer to convert it into a strongly bonded and robust silicon dioxide layer. The article is particularly useful in electronics, and has a low leakage current and low responsiveness to visible light.

US Patent:

57025860, Dec 30, 1997

Filed:

Jun 28, 1994

Appl. No.:

8/266770

Inventors:

Pehr E. Pehrsson - Alexandria VA
Michael L. Marchywka - Lanham MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C25F 302
C25F 316

US Classification:

205640

Abstract:

Process of smoothing or polishing a diamond surface to reduce asperities reon to a level as low as about 20 nm from the horizontal by implanting the diamond surface with ions to form a non-diamond carbon damage layer on or below the diamond surface below the disparity depth and dissolving the non-diamond carbon by submerging the non-diamond carbon in a liquid having sufficient electric field to dissolve the non-diamond carbon.

US Patent:

55872107, Dec 24, 1996

Filed:

Jun 28, 1994

Appl. No.:

8/266758

Inventors:

Michael J. Marchywka - Lanham MD
Pehr E. Pehrsson - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C23C 1402
C23C 1626

US Classification:

427523

Abstract:

A process for making diamond and diamond products includes the steps of ianting ions in a diamond substrate to form a damaged layer of non-diamond carbon below the top surface of the substrate, heating the substrate to about 600-1200. degree. C. growing diamond on the top surface of the heated substrate by chemical vapor deposition, and electrochemically etching the damaged layer to separate the grown diamond from the substrate along the damage layer. The diamond product consists of a first diamond layer and a second diamond layer attached to the first layer. The second layer contains damage caused by ions traversing the second layer.

US Patent:

53594118, Oct 25, 1994

Filed:

Jun 8, 1992

Appl. No.:

7/896079

Inventors:

Michael J. Marchywka - Lanham MD
Dennis G. Socker - Bowie MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01B 902

US Classification:

356345

Abstract:

An apparatus and method for optically testing an object, such as an optical etector whose pixels are an array of optically sensitive charged coupled devices. Two mutually coherent beams of light are interfered on the object to form an interference fringe pattern of sinusoidally varying intensity of preselected spatial frequency. The object's response at this spatial frequency is used to determine one point of the object's modulation transfer function at that frequency. This is preferably done by using the device's output to infer the coherence function of the fringe pattern, taking the Fourier transform of the coherence function, and determining the amplitude of the function at the spatial frequency of the fringe pattern. The process can be repeated for different spatial frequencies until one determines the entire modulation transfer function.

US Patent:

58915753, Apr 6, 1999

Filed:

Feb 22, 1996

Appl. No.:

8/605690

Inventors:

Michael J. Marchywka - Lanham MD
Pehr E. Pehrsson - Alexandria VA

Assignee:

United States as represented by the Secretary of the Navy - Washington DC

International Classification:

B01J 306

US Classification:

428408

Abstract:

A process for making diamond and diamond products includes the steps of implanting ions in a diamond substrate to form a damaged layer of non-diamond carbon below the top surface of the substrate, heating the substrate to about 600-1200. degree. C. , growing diamond on the top surface of the heated substrate by chemical vapor deposition, and electrochemically etching the damaged layer to separate the grown diamond from the substrate along the damage layer. The diamond product consists of a first diamond layer and a second diamond layer attached to the first layer. The second layer contains damage caused by ions traversing the second layer.

US Patent:

60870052, Jul 11, 2000

Filed:

Oct 22, 1993

Appl. No.:

8/140388

Inventors:

Michael J. Marchywka - Lanham MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 2966

US Classification:

428408

Abstract:

An article includes a diamond substrate which is securely adhered to a rot layer of silica layer that cannot be scratched by a tungsten probe or delaminated from the diamond substrate by pulling on a gold wire secured to the silica layer. This aricle can be made by electrochemically cleaning the diamond substrate to remove non-diamond carbon adhering thereto, depositing a fragile layer of silica layer which weakly bonds to the cleaned diamond, and annealing the fragile silica layer to convert it into a strongly bonded and robust silicon dioxide layer. The article is particularly useful in electronics, and has a low leakage current and low responsiveness to visible light.