Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 25, Issue 1, Pages 47-50Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2012.2227698
Keywords
Enhanced transmission; midinfrared region; nanoparticles; surface plasmon; thermal annealing
Funding
- National Science Council of the Republic of China [NSC 100-2120-M-002]
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The enhanced transmission of higher order plasmon modes with random gold nanoparticles embedded in periodic hole arrays using asymmetric pair aperture as a unit is investigated in the midinfrared regime. Different thicknesses of gold film were deposited inside holes and then annealed to form randomly sized and distributed nanoparticles. The holes deposited with thin gold film exhibit significantly enhanced transmission in higher order modes after thermal annealing. The enormous local electric field around the nanoparticles enhances the scattering effect that contributes to the enhanced infrared transmission. This unique design, which integrates localized and propagating surface plasmons, provides an easy way for midinfrared applications in need of enhanced transmission in higher order modes.
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