Maryland's Defense Patent Database

The defense community in Maryland is an R&D powerhouse.

Use this database to see the innovative patents that are poised for commercialization.

Metamaterial structure has resonant and strip line elements comprising a photoconductive semiconductor material formed on substrate to induce negative permeability and negative permittivity in operating frequency range

Patent image
NRL

Materials and structures whose index of refraction can be tuned over a broad range of negative and positive values by applying above band-gap photons to a structure with a strip line element, a split ring resonator element, and a substrate, at least one of which is a photoconductive semiconductor material. Methods for switching between positive and negative values of n include applying above band-gap photons to different numbers of elements. In another embodiment, a structure includes a photoconductive semiconductor wafer, the wafer operable to receive above band-gap photons at an excitation frequency in an excitation pattern on a surface of the wafer, the excitation patterns generating an effective negative index of refraction. Methods for switching between positive and negative values of n include projecting different numbers of elements on the wafer. The resonant frequency of the structure is tuned by changing the size of the split ring resonator excitation patterns.

Inventors: 
Tonucci, Ronald J.
Patent Number: 
Technical domain: 
Optics
FIle Date: 
2006-11-14
Grant Date: 
2010-03-23
Grant time: 
1,225 days
Grant time percentile rank: 
22
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
2
Assignee: 
US NAVY