Abstract
Sub-wavelength artificial photonic structures can be introduced to tailor and modulate the spectrum of materials, thus expanding the optical applications of these materials. On the basis of SiO2/Cu/ITO arrays, a hybrid coupled resonance (HCR) mechanism, including the epsilon-near-zero (ENZ) mode of ITO, local surface plasmon resonance (LSPR) mode and the microstructural gap resonance (GR) mode, was proposed and researched by systematically regulating the array period and layer thickness. The optical absorptions of the arrays were simulated under different conditions by the finite-difference time-domain (FDTD) method. ITO films were prepared and characterized to verify the existence of ENZ mode and Mie theory was used to describe the LSPR mode. The cross-sectional electric field distribution was analyzed while SiO2/Cu/ITO multilayers were also fabricated, of which absorption was measured and calculated by Macleod simulation to prove the existence of GR and LSPR mode. Finally, the broad-band tailoring of optical absorption peaks from 673 nm to 1873 nm with the intensities from 1.8 to 0.41 was realized, which expands the applications of ITO-based plasmonic metamaterials in the near infrared (NIR) region.
Highlights
Selective spectral tailoring and manipulation based on sub-wavelength artificial photonic structures have been widely used in many fields such as new energy sources, sensors, spectral detection imaging, nano-scale photothermical conversion and transfer [1,2,3]
Shifts are due to three resonance modes that exist in the nanostructure, namely ENZ mode, gap resonance (GR) mode and local surface plasmon resonance (LSPR) mode
When a = 103 nm, the arrays exhibit strong optical absorption intensities from S-near infrared (NIR) to M-NIR owing to the great GR coupling effect caused by the small gap distance
Summary
Selective spectral tailoring and manipulation based on sub-wavelength artificial photonic structures have been widely used in many fields such as new energy sources, sensors, spectral detection imaging, nano-scale photothermical conversion and transfer [1,2,3]. The GR mode could be introduced by ITO-based metamaterials [35,36,37], which could enhance the local optical coupling strength and tune the wavelength range of plasma resonance [38,39,40].
Sign-in/Register to view highlights & summary 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.
