title: Wide angle and narrow-band asymmetric absorption in visible and near-infrared regime through lossy Bragg stacks.
abstract: Absorber is an important component in various optical devices. Here we report a novel type of asymmetric absorber in the visible and near-infrared spectrum which is based on lossy Bragg stacks. The lossy Bragg stacks can achieve near-perfect absorption at one side and high reflection at the other within the narrow bands (several nm) of resonance wavelengths, whereas display almost identical absorption/reflection responses for the rest of the spectrum. Meanwhile, this interesting wavelength-selective asymmetric absorption behavior persists for wide angles, does not depend on polarization, and can be ascribed to the lossy characteristics of the Bragg stacks. Moreover, interesting Fano resonance with easily tailorable peak profiles can be realized using the lossy Bragg stacks.
authors.affiliation: Center Of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Nanshan District, Shenzhen, China.
authors.forename: Shiwei
authors.initials: S
authors.lastname: Shu
authors.affiliation: Center Of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Yawen
authors.initials: Y
authors.lastname: Zhan
authors.affiliation: Center Of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Chris
authors.initials: C
authors.lastname: Lee
authors.affiliation: City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Nanshan District, Shenzhen, China.|Department of Mechanical and Biological Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Jian
authors.initials: J
authors.lastname: Lu
authors.affiliation: Center Of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.|City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Nanshan District, Shenzhen, China.
authors.forename: Yang Yang
authors.initials: YY
authors.lastname: Li