Abstract
Based on an integrated array of refractory titanium nitride (TiN), a metasurface perfect absorber (MPA) in the visible-to-near infrared (NIR) band is reported. The systematic and detailed simulation study of the absorption of the MPA is performed with the finite-different time-domain (FDTD) method. Tailoring the structure, the MPA realizes as high an average as 99.6% broadband absorption, ranging from 400 nm to 1500 nm. The broadband perfect absorption can be attributed to localized surface plasmonic resonance (LSPR), excited by the continuous diameter evolution from the apex to the base of the nanocone, and the gap plasmons excited among the nanocones, as well as in the spacer layer at longer wavelengths. Particularly, the coupling of the resonances is essentially behind the broadening of the absorption spectrum. We also evaluated the electric field intensity and polarization-dependence of the nanocone MPA to offer further physical insight into light trapping capability. The MPA shows about 90% average absorption even at an oblique incidence up to 50°, which improves the acceptance capability of light-harvesting system applications. This unique design with the TiN nanocone array/aluminium oxide (Al2O3)/TiN structure shows potential in imminent applications in light trapping and thermophotovoltaics.
Highlights
The perfect absorber has drawn great attention due to the flexible adjustability in optical designs and its potential application including sensing [1], infrared imaging [2,3], solar energy harvesting [4,5,6], and so on [7,8,9,10,11]
The perfect absorption based on the Titanium nitride (TiN) square-ring array was first studied with broadband absorption, throughout the entire visible regime [21]
The absorber based on a TiN nanodisk array was studied with perfect absorption, from 400 nm to 700 nm [23]
Summary
The perfect absorber has drawn great attention due to the flexible adjustability in optical designs and its potential application including sensing [1], infrared imaging [2,3], solar energy harvesting [4,5,6], and so on [7,8,9,10,11]. The absorber based on a TiN nanodisk array was studied with perfect absorption, from 400 nm to 700 nm [23]. WWee cchhoooossee TTiiNN aass tthhee ssuubbssttrraattee,, wwiitthh aa tthhiicckknneessss ooff 550000 nnmm ttoo pprreevveenntt ttrraannssmmiissssiioonn ooff tthhee iinncciiddeenntt lliigghhtt..
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
