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Open AccessArticle

Broadband Absorption Tailoring of SiO2/Cu/ITO Arrays Based on Hybrid Coupled Resonance Mode

1
Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
2
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 852; https://doi.org/10.3390/nano9060852
Received: 10 May 2019 / Revised: 29 May 2019 / Accepted: 31 May 2019 / Published: 4 June 2019
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. View Full-Text
Keywords: SiO2/Cu/ITO arrays; ITO thin films; ENZ mode; hybrid coupled resonance; FDTD; Macleod simulation; spectral tailoring SiO2/Cu/ITO arrays; ITO thin films; ENZ mode; hybrid coupled resonance; FDTD; Macleod simulation; spectral tailoring
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MDPI and ACS Style

Lian, J.; Zhang, D.; Hong, R.; Yan, T.; Lv, T.; Zhang, D. Broadband Absorption Tailoring of SiO2/Cu/ITO Arrays Based on Hybrid Coupled Resonance Mode. Nanomaterials 2019, 9, 852.

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