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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 plot of the dielectric constant of gold as a function of photon energy. The red dash line is the negative of the real part of permittivity, and the blue solid line is the imaginary part of permittivity.
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Figure 1: The plot of the dielectric constant of gold as a function of photon energy. The red dash line is the negative of the real part of permittivity, and the blue solid line is the imaginary part of permittivity.

Mentions: where ωp is the plasma frequency (for gold ωp = 9.03 eV or 137 nm). The critical point parameters (shown in Table 1) of gold film dielectric function are converted to the finite difference time domain (FDTD) software of MEEP [15] with setting εGf = 5.135. The plot of the dielectric function of gold (shown in Figure 1) matches with experimental results very well.


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

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

The plot of the dielectric constant of gold as a function of photon energy. The red dash line is the negative of the real part of permittivity, and the blue solid line is the imaginary part of permittivity.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: The plot of the dielectric constant of gold as a function of photon energy. The red dash line is the negative of the real part of permittivity, and the blue solid line is the imaginary part of permittivity.
Mentions: where ωp is the plasma frequency (for gold ωp = 9.03 eV or 137 nm). The critical point parameters (shown in Table 1) of gold film dielectric function are converted to the finite difference time domain (FDTD) software of MEEP [15] with setting εGf = 5.135. The plot of the dielectric function of gold (shown in Figure 1) matches with experimental results very well.

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