Patanjali V Parimi

US Patent:

20090086322, Apr 2, 2009

Filed:

May 16, 2006

Appl. No.:

11/920613

Inventors:

Wentao T. Lu - Malden MA, US
Srinivas Sridhar - Newton MA, US
Plarenta Vodo - Malden MA, US
Patanjali Parimi - Belmont MA, US
Yongjian Huang - Malden MA, US

Assignee:

NORTHEASTERN UNIVERSITY - Boston MA

International Classification:

G02B 3/00
G02B 1/02
G02B 27/44

US Classification:

359570, 359642

Abstract:

Negative refraction in photonic crystals and diffraction grating is used to design plano-concave lenses to focus plane waves. Microwave experiments are carried out to demonstrate negative refraction and the performance of these lenses. Demonstration of negative refraction of visible light is also performed for the grism. These lenses can be used in optical circuits, astronomical applications, etc.

US Patent:

20180287262, Oct 4, 2018

Filed:

Apr 4, 2018

Appl. No.:

15/944791

Inventors:

- Albany NY, US
Patanjali V. Parimi - Liverpool NY, US
Michael Kolacki - Oswego NY, US

Assignee:

The Research Foundation for SUNY - Albany NY

International Classification:

H01Q 15/02
H01Q 13/02

Abstract:

Orbital angular momentum (OAM) communications systems provide an additional degree of freedom to the electromagnetic waves that travel between the transmission and receiving stations, thereby enabling a dramatic increase in data transmission rates. The present invention provides a design for a very low reflectivity flat spiral phase plate that generates OAM modes and a method of making the same. The design incorporates variable sizes of perforated unit cells and may include matched layers to provide improved impedance matching, and the flat disc shape makes the phase plate compact and easy to install. The OAM phase plate can be designed to operate at frequencies from a few 100s KHz to ultraviolet frequencies and is capable of providing one or more OAM modes at the operational frequencies, irrespective of polarization. In a preferred embodiment, the OAM phase plate is designed for operation at about 30 GHz frequency, with 20 GHz bandwidth.