Ultra-thin optical interference coatings on rough and flexible substrates | Zendy

Mikhail A. Kats | Zendy; Federico Capasso | Zendy

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Ultra-thin optical interference coatings on rough and flexible substrates

Author(s) -

Mikhail A. Kats,

Federico Capasso

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4896527

Subject(s) - germanium , materials science , interference (communication) , thin film , nanometre , substrate (aquarium) , surface finish , optoelectronics , amorphous solid , absorption (acoustics) , optics , surface roughness , nanotechnology , composite material , silicon , chemistry , crystallography , channel (broadcasting) , oceanography , physics , geology , electrical engineering , engineering

Recently demonstrated ultra-thin optical coatings comprising nanometer-thick highly absorbing films on top of reflecting substrates can display strong optical interference effects, resulting in structural colors and absorption enhancement. Here, we demonstrate that these optical interference effects persist when the films are deposited on substrates that have a large degree of roughness and inhomogeneity on micro- and nano-scales. In particular, we deposited films of gold and amorphous germanium onto paper which serves as a rough and flexible substrate and observe matte interference colors that vary as a function of the germanium thickness.

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