Laser & Optoelectronics Progress, Volume. 56, Issue 15, 152501(2019)
Formation of Orthogonal and Parallel Surface-Lattice Resonances with Asymmetric Nanoparticle Array
Surface-lattice resonances generated by using noble-metallic nanoparticle arrays can effectively suppress radiation loss, thereby improving the resonance quality factor and increasing localized field intensity. Surface-lattice resonances have been widely used for designing high-performance micro-nano photonic devices. Realizing the simultaneous excitation of orthogonal and parallel surface-lattice resonances is crucial for manipulating the collective responses of nanoparticle arrays, which is also useful for practical applications. Herein, we design an array structure composed of L-shaped nanoantennas. Furthermore, we investigate the optical response caused by the coupling between the Rayleigh anomaly and bonding/antibonding modes. We find that the two kinds of surface-lattice resonances can be excited simultaneously in extinction spectra. Calculation results reveal that the bonding/antibonding modes can be used to couple with Rayleigh anomaly, thereby leading to the formation of orthogonal and parallel surface-lattice resonances. These properties make asymmetric nanoparticle arrays become promising platforms for designing micro-nano photonic devices.
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Haojie Hou, Junyan Liu, Bowen Xiao, Mingqi Zhu, Mengchun Li. Formation of Orthogonal and Parallel Surface-Lattice Resonances with Asymmetric Nanoparticle Array[J]. Laser & Optoelectronics Progress, 2019, 56(15): 152501
Category: OPTOELECTRONICS
Received: Jan. 31, 2019
Accepted: Mar. 7, 2019
Published Online: Aug. 5, 2019
The Author Email: Li Mengchun (limmc163@163.com)