# US 7,611,969 B2 · Generation and applications of negative dielectric constant materials

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- Number: US 7,611,969 B2
- Document ID: US7611969B2
- Status: Granted
- Kind: B2
- Application number: 11/356,767
- Filed: 2006-02-17
- Published: 2007-05-17
- Granted: 2009-11-03
- Earliest claimed: 2005-02-17
- Assignees: University of Houston
- Inventors: Ching-Wu Chu; Feng Chen; Yu-Yi Xue; Jason Shulman; Stephen Tsui
- Web page: https://patentgrep.com/patent/US7611969B2

## CPC

- G02F 1/0009: {Materials therefor}
- G02F 2202/30: Metamaterials
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A negative dielectric is induced by the application of a dc bias-electric field in aggregates of oxide nano-particles whose surfaces have been specially treated. The magnitude of the dielectric constant and the frequency where the negative dielectric constant occurs can be adjusted. Such material systems have profound implications in novel devices as well as in science development, e.g. unusual wave propagation, secured communication and ultra-high temperature superconductivity.

## Claims

### Claim 1

A method to induce a negative dielectric constant in at least one material to achieve a negative dielectric constant state, comprising:
introducing a dc bias across nano-particles within the at least one material, wherein the at least one material comprises 20 nm urea-coated Ba0.8Rb0.4TiO(C2O4)2 nano-particles suspended in silicone oil.