THIS GRANT IS A CONTINUATION OF N000141410475 Dielectric Based Optical Metamaterials
Abstract
The following tasks will be performed: 1. Development of Disordered Perfect Reflecting Dielectric Metamaterials 2. Development of Polarization Independent Zero-Index Dielectric Metamaterials 3. Development of Fano-Resonant Dielectric Metamaterials 4. Application of Fano Resonances in Dielectric Metamaterials Objective: This proposal outlines a creative research plan to develop three-dimensional dielectric metamaterials at optical frequencies based on high index semiconductors. Approach: Dr. Valentine will investigate the use of metamaterials with a near-zero effective refractive index to mitigate spatial dispersion and realize a wide-angle response. This novel approach to the creation of low loss metamaterials impedance matched to free space would represent a significant evolution from current metal based designs. The increased dimensionality and isotropy allows access to numerous applications which have been difficult to achieve at optical frequencies including compact lens systems for imaging, wide angle frequency selective surfaces, and transformation optics devices. He will also explore will explore Fano resonances in dielectric metamaterials to achieve zero-index metamaterials, leading to broadband slow-light and highly sensitive detection. Progress Statement: Scaling of dielectric metamaterial fabrication to large areas was demonstrated using self-assembly based patterning techniques. This technique allows the metamaterial patterns to be scaled to sizes greater than 2cm x 2cm. Using this technique, perfect reflectors operating in the telecommunications band have been realized, showing an average reflection of 99.2% over large area with low variation. Fano-resonant metamaterials were shown to significantly enhance nonlinear conversion. These metamaterials possess quality factors (Q-factor) in excess of 500, around 50 times that of plasmonic metamaterials. This large Q-factor results in strong field enhancement within the silicon and subsequent third harmonic generation. A 10^5 enhancement factor was measured, among the highest ever reported for a thin film.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 23, 2016
- Source ID
- N000141612283
Entities
People
- Jason Valentine
Organizations
- Office of Naval Research
- United States Navy
- Vanderbilt University