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Metallic nano-structures for polarization-independent multi-spectral filters.

Tang Y, Vlahovic B, Brady DJ - Nanoscale Res Lett (2011)

Bottom Line: Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves.We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features.It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Department of Physics, North Carolina Central University, Durham, NC, 27707, USA. tangy@nccu.edu.

ABSTRACT
Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves. We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features. It is observed that two well-separated and high transmission efficiency peaks could be obtained by designing the parameters in the CSHAs for both p-polarized and s-polarized waves; and a nice transmission band-pass is also observed by specific parameters of a CSHA too. It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters. These findings provide potential applications of the metallic nano-structures in optical filters, optical band-pass, optical imaging, optical sensing, and biosensors.

No MeSH data available.


Related in: MedlinePlus

The cross-section views of xz plane and yz plane of the plane wave electric field when it is propagating through the sub-wavelength hole arrays of 350 nm rectangular hole (250 nm × 50 nm) array on various thicknesses (100 to 500 nm) of gold film on corresponding thicknesses.
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Figure 4: The cross-section views of xz plane and yz plane of the plane wave electric field when it is propagating through the sub-wavelength hole arrays of 350 nm rectangular hole (250 nm × 50 nm) array on various thicknesses (100 to 500 nm) of gold film on corresponding thicknesses.

Mentions: As we mentioned above, the localized SPs by the sub-wavelength holes propagate on the metal surface and into the holes, then these SPs or electric field experience the difference of the refractive index at the exits of the holes, some SPs emit from the holes and couple to light, and some SPs are reflected back to the holes, as a result, Fabry-Perot kind of cavities are formed due to the difference of the refractive index at the exits of the holes. The role of the Fabry-Perot cavity of these sub-wavelength-hole arrays is important to the applications of these metallic structures as a multi-spectral filter or a FSS. This Fabry-Perot cavity effect is shown by electric field distributions in xz plane and in yz plane in Figure 4, which is obtained by varying the thickness of the metal film (from 100 to 500 nm) analog to the cavity length, while keeping the periodicity of D = 350 nm and the feature of the rectangular hole of 250 nm × 50 nm as constants.


Metallic nano-structures for polarization-independent multi-spectral filters.

Tang Y, Vlahovic B, Brady DJ - Nanoscale Res Lett (2011)

The cross-section views of xz plane and yz plane of the plane wave electric field when it is propagating through the sub-wavelength hole arrays of 350 nm rectangular hole (250 nm × 50 nm) array on various thicknesses (100 to 500 nm) of gold film on corresponding thicknesses.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211488&req=5

Figure 4: The cross-section views of xz plane and yz plane of the plane wave electric field when it is propagating through the sub-wavelength hole arrays of 350 nm rectangular hole (250 nm × 50 nm) array on various thicknesses (100 to 500 nm) of gold film on corresponding thicknesses.
Mentions: As we mentioned above, the localized SPs by the sub-wavelength holes propagate on the metal surface and into the holes, then these SPs or electric field experience the difference of the refractive index at the exits of the holes, some SPs emit from the holes and couple to light, and some SPs are reflected back to the holes, as a result, Fabry-Perot kind of cavities are formed due to the difference of the refractive index at the exits of the holes. The role of the Fabry-Perot cavity of these sub-wavelength-hole arrays is important to the applications of these metallic structures as a multi-spectral filter or a FSS. This Fabry-Perot cavity effect is shown by electric field distributions in xz plane and in yz plane in Figure 4, which is obtained by varying the thickness of the metal film (from 100 to 500 nm) analog to the cavity length, while keeping the periodicity of D = 350 nm and the feature of the rectangular hole of 250 nm × 50 nm as constants.

Bottom Line: Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves.We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features.It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Department of Physics, North Carolina Central University, Durham, NC, 27707, USA. tangy@nccu.edu.

ABSTRACT
Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves. We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features. It is observed that two well-separated and high transmission efficiency peaks could be obtained by designing the parameters in the CSHAs for both p-polarized and s-polarized waves; and a nice transmission band-pass is also observed by specific parameters of a CSHA too. It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters. These findings provide potential applications of the metallic nano-structures in optical filters, optical band-pass, optical imaging, optical sensing, and biosensors.

No MeSH data available.


Related in: MedlinePlus