Yang Zehua, Song Yang, Chen Shuang, et al. Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns[J]. Opto-Electronic Engineering, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207
Citation: Yang Zehua, Song Yang, Chen Shuang, et al. Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns[J]. Opto-Electronic Engineering, 2018, 45(11): 180207. doi: 10.12086/oee.2018.180207

Control of EOT of subwavelength metal bullseye structures by coaxial nano-columns

    Fund Project: Supported by Natural Science Foundation of Heilongjiang Province (F2018027)
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  • The bullseye structure is a classic nano-optical structure. This article designs a new bullseye structure with coaxial nano-pillars. We used the time-domain finite difference method (FDTD) to study the EOT of the structure. Studies show that the radius and height of the column have a significant impact on the transmission characteristics. The proper choice of the radius and height of the column will support the maximum transmission intensity. In addition, the bullseye structure has a higher sensitivity to the environmental refractive index. Theoretical analyses show that the enhancement transmission effect of the structure is caused by the interaction between the local surface plasmon and the surface plasmon polarization. This provides a new idea for the development and application of nano-photonic components.
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  • Overview: In 1998, the Ebbesen team reported the phenomenon of extraordinary optical transmission in arrays of subwavelength hole on metal substrate. Since then, people have conducted extensive research on the mechanism of EOT and proposed several theoretical models. Ebbesen, Ghaemi et al. proposed surface plasmon excitation and Wood extraordinary effects. In 2004, Koerkamp et al. studied the influence of the aspect ratio of the rectangular aperture on the transmission peak and the central wavelength. They believed that the coupling between local waveguide resonance and plasmon resonance led to EOT. Similar models also have compound diffraction evanescent wave mode proposed by Lezec and Thio et al. At present, people mainly use square holes, round holes, triangular holes, wedge-shaped slits, and groove arrays to study EOT. The bullseye structure is a kind of round-hole structure. It is a single-hole structure surrounded by periodic surface corrugation proposed by Thio in 2002. Due to its circular symmetry, it can make Huygens waves better matches the plasmon mode under random polarized light, so it has a higher transmission coefficient than the square-hole structure and the groove array structure.

    We designed a bullseye structure with coaxial nano-pillars and used the finite-difference time-domain method to simulate the transmission characteristics of proposed new structure. The specific simulation tool we used is FDTD Solution. We studied the influence of the radius and height of the nano-column on the transmission. The results show that changing the radius and height of the column can significantly change the peak and resonance wavelength of the main transmission peak. When the nano-column has a radius of 46 nm and a height of 20 nm, the bullseye structure obtains the maximum transmission intensity, whose the main transmission peak increases by about 90% compared to the bullseye structure without filling. In addition, the main transmission peak wavelength of the structure changes approximately linearly with the ambient refractive index, and the refractive index sensitivity can reach 653.4 nm/RIU. Theoretical analyses show that the physical mechanism of the effect of nano-columns on the transmission characteristics of bullseye structures is that under the excitation of incident light, the LSP polarized by the nano-columns couples with the SPP and LSP existing in the structure, resulting in a change in resonance position and intensity, further leading to frequency shifts and peak changes. By changing the geometry of the nano-pillars, the transmitted light intensity of the bullseye structure can be controlled. In addition, because the structure has a high sensitivity to environmental refractive index, it has potential applications in the field of refractive index sensors.

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