Journal
OPTICAL MATERIALS
Volume 62, Issue -, Pages 261-266Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2016.10.012
Keywords
Bloch surface wave; Narrow band absorber; Perfect absorption; Photonic crystal; Critic coupling
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Funding
- National Natural Science Foundation of China [61505071]
- Natural Science Foundation of Jiangsu Province [BK20150526]
- China Postdoctoral Science Foundation [2016M591776]
- Advanced Talents Foundation of Jiangsu University [15JDG036, 15JDG037]
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We demonstrate the unity absorption of visible light with an ultra-narrow 0.1 nm linewidth. It arises from the Bloch surface wave resonance in alternating TiO2/SiO2 multilayers. The total absorption and narrow linewidth are explained from the radiative and absorptive damping, which are quantitatively determined by the temporal coupled mode theory. When a silver film with proper thickness is added to the absorber, the perfect absorption is achieved with only 3 structural bilayers, in contrast with 8 bilayers required without Ag. Furthermore, significant field enhancement and an ultrahigh 2600/RIU sensing figure-of-merit are simultaneously obtained at resonance, which might facilitate applications in nonlinear optical devices and high resolution refractive index sensing. (C) 2016 Elsevier B.V. All rights reserved.
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