Anomalous Light Transmission from Plasmonic-Capped Nanoapertures

作者：Imura Kohei; Ueno Kosei; Misawa Hiroaki; Okamoto Hiromi^*

来源：Nano Letters, 2011, 11(3): 960-965.

DOI：10.1021/nl103408h

• Plasmonic nanostructure
• nanodisk
• nanoaperture
• scanning near-field optical microscope
• enhanced light transmission

We report an anomalous light transmission phenomenon for a nanoaperture on an opaque screen when the aperture is covered with an opaque cap. In conventional optics, light transmission must decrease when the aperture is capped. However, we found that light transmission is enhanced when the nanodisk is in close proximity to the aperture at a wavelength dose to the plasmon resonance. This effect even occurs when the disk is larger than the aperture.

• 出版日期2011-3