Understanding optical properties of nano slits using the diffraction theory

Sub-wavelength apertures in metallic film exhibit a number of anomalous optical characteristics, such as enhanced transmission, anomalous absorption, and phase resonance. Despite their apparent simplicity, such apertures remained the topic of study and debates for centuries. After the discovery of the extraordinary optical transmission of the 2D metallic sub-wavelength hole arrays, the interest of 1D slit structure was renewed. Previous work of sub-wavelength resonator was done by applying the single or periodic resonators. In our lab, we propose few slits or hole array to verify not only the single sub-wavelength resonator property, but also interaction among these few resonators. We assure that our work can show the features of coupled sub-wavelength resonators not reported before.

Relevant Publications
[1] Kang, J. H., Choe, J., Kim, D. S. & Park, Q. Substrate effect on aperture resonances in a thin metal film Abstract : 17, 15652–15658 (2009).
[2] Kang, J., Kim, D. & Park, Q.-H. Local Capacitor Model for Plasmonic Electric Field Enhancement. Phys. Rev. Lett. 102, 1–4 (2009).
[3] Choe, J., Kang, J., Kim, D. & Park, Q. Slot antenna as a bound charge oscillator. Opt. Express 20, 6521–6526 (2012).