Two-dimensional optically active ZnO shells on polystyrene (PS) templates have been fabricated using a sputtering technique. Periodic ZnO hollow half-shell structure has been obtained by removing PS templates. It exhibits several anomalous dips in transmission spectra that have not been reported. The dips can be tuned up by changing the shell thickness and PS sphere size. The PL spectra confirm that the structure has enhanced defect emission of ZnO.
We demonstrate here that the enhancement of optical transmission originates not only from surface plasmons ͑SPs͒ but also from the coupling of SPs in the Ag/ SiO 2 multilayer with a periodic array of subwavelength holes. The multilayer film is constructed by repeating a building block, which contains two layers: one is a silver film with periodic array of subwavelength holes and the other is a film of SiO 2 . The multilayers were fabricated by magnetron sputtering, and the array of holes was milled with focused-ion-beam facility. The measured optical transmission properties reasonably agree with our numerical calculations. It is shown that the coupling of SPs strongly depends on the detailed structure, and in our system, the coupled SPs can be characterized by using an effective-permittivity model. In the sandwiched structure with nanostructured silver, the coupling of SPs leads to the shift of transmission peaks, while in a nanostructured Ag/ SiO 2 multilayer, the coupling of SPs yields a new resonant mode with increased quality factor of the transmission peak, which originates from multiple scatterings and the coupling of electromagnetic waves on the interfaces of the multilayers. These properties may be utilized to tune electromagnetic wave in subwavelength optics.
In this paper, we will propose that magnetic resonance nanostructures in a metal surface could be used to realize extraordinary optical transmission (EOT). Toward this goal, we designed and fabricated a one-dimensional diatomic chain of slit-hole resonator (SHR). Due to the strong exchange current interaction, a type of magnetic plasmon (MP) propagation mode with a broad frequency bandwidth was established in this system. Apparent EOT peaks induced by the MP mode were observed in our measured spectra at infrared frequencies. The strongest EOT peak was obtained at 1.07eV with an incident angle of 20 0 . The measured dependence of EOT peaks on the incident angle coincided with the theoretical results quite well. This proposed MP propagation mode in SHR structure has good potential applications in multi-frequency nonlinear optical processes.
A well-developed phase modulation method is utilized to design a nanogroove grating for a desired diffraction process, which gives rise to the conversion of a surface plasmon wave to an Airy-like radiation beam. Experiments and simulations revealed the unique characteristics of the generated Airy-like beam, such as nonspreading, self-bending, and self-healing. Our result confirms the validation of the diffraction strategy for beam engineering in conversions and possibly indicates wider applications in broader areas.
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