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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 transmission spectrum of a CSHA. (L = 280 nm and D = 350 nm) with: (a) thickness of h = 100 nm and h = 200 nm with W = 10 nm; (b) thickness of h = 250 nm and h = 350 nm with W = 10 nm; (c) thickness of h = 400 nm and h = 500 nm with W = 10 nm; (d) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 200 nm; (e) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 350 nm; (f) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 500 nm.
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Figure 5: The transmission spectrum of a CSHA. (L = 280 nm and D = 350 nm) with: (a) thickness of h = 100 nm and h = 200 nm with W = 10 nm; (b) thickness of h = 250 nm and h = 350 nm with W = 10 nm; (c) thickness of h = 400 nm and h = 500 nm with W = 10 nm; (d) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 200 nm; (e) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 350 nm; (f) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 500 nm.

Mentions: The transmission spectra of the Fabry-Perot cavity of the CSHAs are shown in Figure 5. The Fabry-Perot like cavity effect of the thickness of the CSHAs is similar to that of the rectangle-hole array in Figure 4. Widths of W = 10 nm, lengths of L = 280 nm, and period of D = 350 nm are the parameters of the cross-shaped holes used for the plots of Figure 5a,b,c. It is observed that one transmission peak is centered at wavelength of approximately 1.25 μm (Figure 5a) for a thin gold film (h = 100 nm); two quite even transmission peaks are observed in Figure 5a,b both in thickness of h = 200 nm and h = 250 nm, respectively; however, the locations of these peaks are different corresponding the gold film thickness, and the two transmission peaks of 250 nm thick film are closer than these of 200 nm thick film; the third peak in the transmission spectrum emerges for a thickness of 350 nm gold film (Figure 5b); it is also observed that the third transmission peak of the 500 nm thick gold film is higher than that of 400 nm thick gold film (Figure 5c), but the center wavelengths of these three peaks are closer for the 500 nm thick gold film.


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

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

The transmission spectrum of a CSHA. (L = 280 nm and D = 350 nm) with: (a) thickness of h = 100 nm and h = 200 nm with W = 10 nm; (b) thickness of h = 250 nm and h = 350 nm with W = 10 nm; (c) thickness of h = 400 nm and h = 500 nm with W = 10 nm; (d) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 200 nm; (e) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 350 nm; (f) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 500 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: The transmission spectrum of a CSHA. (L = 280 nm and D = 350 nm) with: (a) thickness of h = 100 nm and h = 200 nm with W = 10 nm; (b) thickness of h = 250 nm and h = 350 nm with W = 10 nm; (c) thickness of h = 400 nm and h = 500 nm with W = 10 nm; (d) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 200 nm; (e) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 350 nm; (f) W = 10 nm (L = 330 nm), 20 nm, and 50 nm and thickness of h = 500 nm.
Mentions: The transmission spectra of the Fabry-Perot cavity of the CSHAs are shown in Figure 5. The Fabry-Perot like cavity effect of the thickness of the CSHAs is similar to that of the rectangle-hole array in Figure 4. Widths of W = 10 nm, lengths of L = 280 nm, and period of D = 350 nm are the parameters of the cross-shaped holes used for the plots of Figure 5a,b,c. It is observed that one transmission peak is centered at wavelength of approximately 1.25 μm (Figure 5a) for a thin gold film (h = 100 nm); two quite even transmission peaks are observed in Figure 5a,b both in thickness of h = 200 nm and h = 250 nm, respectively; however, the locations of these peaks are different corresponding the gold film thickness, and the two transmission peaks of 250 nm thick film are closer than these of 200 nm thick film; the third peak in the transmission spectrum emerges for a thickness of 350 nm gold film (Figure 5b); it is also observed that the third transmission peak of the 500 nm thick gold film is higher than that of 400 nm thick gold film (Figure 5c), but the center wavelengths of these three peaks are closer for the 500 nm thick gold film.

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