Multi-Band Ultra-Sharp Transmission Response in All-Dielectric Resonant Structures Containing Kerr Nonlinear Media |
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Authors: | Zhengqi Liu Guolan Fu Zhenping Huang Jing Chen Xiaoshan Liu |
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Institution: | 1.Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics,Jiangxi Normal University,Nanchang,China;2.College of Electronic Science and Engineering, Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing,China |
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Abstract: | All-dielectric resonant structure (ADRS) consisting of high-index nonlinear dielectrics has been theoretically and numerically demonstrated with multi-band ultra-sharp transmission response in this work. Bandwidth down to sub-nanometer and spectral Q-factor up to 920 are achieved in this ADRS-based metamaterial-like platform. Strong resonant electric field distributions by the high-index dielectric resonators and efficient coupling between the layered dielectric particles and the cavity mainly contribute to the multiple narrowband light transmission filtering. By using a Kerr nonlinear medium as the resonant dielectric, the positions of the transmission dips in the spectrum can be actively tuned by the incident light intensity. Due to the ultra-narrow spectral feature and the strong electric field distribution by the resonators, an efficient all-optical switching behavior with high spectral difference intensity and contrast ratio is obtained. Further study presents the observed multi-band transmission with high scalability by tuning the structural parameters. These optical features hold the predicted ADRS be potentially applied to constructing dielectric metamaterial-based all-optical switching or active subtractive transmission filtering with low power threshold at sub-diffraction scale. |
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