Multi-layer photonic structures having omni-directional reflectivity and coatings incorporating the same

US8861087B2 · kind B2 · utility

Assignee

• Toyota Motor Corporation · JP

Inventors

• Debasish Banerjee · Ann Arbor, US
• Benjamin Alan Grayson · Whitmore Lake, US
• Minjuan Zhang · Ann Arbor, US
• Masahiko Ishii · Okazaki, JP

Key dates

• Filing date: Feb 19, 2009
• Grant date: Oct 14, 2014
• Expiry date: Dec 6, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24942
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A multi-layer photonic structure may include alternating layers of high index material and low index material having a form [H(LH)N] where, H is a layer of high index material, L is a layer of low index material and N is a number of pairs of layers of high index material and layers of low index material. N may be an integer ≧1. The low index dielectric material may have an index of refraction nL from about 1.3 to about 2.5. The high index dielectric material may have an index of refraction nH from about 1.8 to about 3.5, wherein nH>nL and the multi-layer photonic structure comprises a reflectivity band of greater than about 200 nm for light having angles of incidence from about 0 degrees to about 80 degrees relative to the multi-layer photonic structure. The multi-layer photonic structure may be incorporated into a paint or coating system thereby forming an omni-directional reflective paint or coating.