UV-reflective structural color

US8446666B2 · kind B2 · utility

Assignees

• TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC. · US
• Toyota Motor Corporation · JP
• Massachusetts Institute of Technology · US

Inventors

• Pinar Kurt · Cambridge, US
• Debasish Banerjee · Ann Arbor, US
• Robert E. Cohen · Brookline, US
• Michael F. Rubner · Westford, US
• Masahiko Ishii · Okazaki, JP
• Minjuan Zhang · Ann Arbor, US

Key dates

• Filing date: May 18, 2009
• Grant date: May 21, 2013
• Expiry date: Nov 13, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2210/20
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present invention discloses a non-quarter wave multilayer structure having a plurality of alternating low index of refraction material stacks and high index of refraction material stacks. The plurality of alternating stacks can reflect electromagnetic radiation in the ultraviolet region and a narrow band of electromagnetic radiation in the visible region. The non-quarter wave multilayer structure, i.e. nLdL≠nHdH≠λ0/4, can be expressed as [A 0.5 qH pL(qH pL)N 0.5 qH G], where q and p are multipliers to the quarter-wave thicknesses of high and low refractive index material, respectively, H is the quarter-wave thickness of the high refracting index material; L is the quarter-wave thickness of the low refracting index material; N represents the total number of layers between bounding half layers of high index of refraction material (0.5 qH); G represents a substrate and A represents air.