Acta Optica Sinica, Volume. 32, Issue 11, 1130002(2012)
Extraordinary Transmission Properties of Gold Aperture Array-Dielectric and Gold-Dielectric Aperture Array
The effects of gold film thickness, refractive index of dielectric and its thickness on extraordinary transmission properties of gold aperture array-dielectric and gold-dielectric aperture array are studied using the finite-difference time-domain (FDTD) method. The results show that both structures have a good extraordinary transmission property, which suggests that surface plasmon polariton (SPP), formed by coupling of light and free electron charge density wave of gold film surface, plays a key role in enhanced transmission. The gold film thickness is the major factor affecting the extraordinary transmission property, and its decay length is 35 nm; the thickness of dielectric film adjacent to the gold film has minimal impact on the extraordinary transmission property. The refractive index of dielectric has a distinct impact on the extraordinary transmission property, and the refractive index of 1.8 may lead to a good extraordinary transmission property.
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Yang Hongyan, Xiao Gongli. Extraordinary Transmission Properties of Gold Aperture Array-Dielectric and Gold-Dielectric Aperture Array[J]. Acta Optica Sinica, 2012, 32(11): 1130002
Category: Spectroscopy
Received: May. 2, 2012
Accepted: --
Published Online: Sep. 26, 2012
The Author Email: Hongyan Yang (yhy.gl@126.com)