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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

(a) Sketch of the structure of the array, and (b) sketch (cross-section view) of the unit cell for simulations.
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Figure 2: (a) Sketch of the structure of the array, and (b) sketch (cross-section view) of the unit cell for simulations.

Mentions: The optical transmission of a square CSHA as a multi-spectral filter or a FSS is investigated. The array, which is patterned on a metal (gold) film, is shown in Figure 2, where D is the period of the array, w and l are the width of the short side and the length of the long side of the cross-shaped-hole, respectively; h is the thickness of the metal film, and its optical properties of the metal are described by the dispersive complex dielectric function above. The software of the FDTD method, MEEP, is applied for the simulations. The FDTD method divides space into discrete grid and then the electromagnetic field evolved in time by using discrete steps. The finer the grid and time steps are, the closer to the true equations of the simulation will be, therefore the better simulation results one could expect.


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

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

(a) Sketch of the structure of the array, and (b) sketch (cross-section view) of the unit cell for simulations.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: (a) Sketch of the structure of the array, and (b) sketch (cross-section view) of the unit cell for simulations.
Mentions: The optical transmission of a square CSHA as a multi-spectral filter or a FSS is investigated. The array, which is patterned on a metal (gold) film, is shown in Figure 2, where D is the period of the array, w and l are the width of the short side and the length of the long side of the cross-shaped-hole, respectively; h is the thickness of the metal film, and its optical properties of the metal are described by the dispersive complex dielectric function above. The software of the FDTD method, MEEP, is applied for the simulations. The FDTD method divides space into discrete grid and then the electromagnetic field evolved in time by using discrete steps. The finer the grid and time steps are, the closer to the true equations of the simulation will be, therefore the better simulation results one could expect.

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