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Structured metal thin film as an asymmetric color filter: the forward and reverse plasmonic halos.

Ye F, Burns MJ, Naughton MJ - Sci Rep (2014)

Bottom Line: We explain this by a three-step process: coupling of photons to surface plasmon polaritons (SPPs), wave interference of SPPs forming resonant cavity modes, and out-coupling from SPPs to photons.Full wave electromagnetic simulations based on the finite element method support our findings.These results may have potential applications in areas such as optical color filtering and biosensing via dielectric detection within the step gap plasmonic cavity.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA.

ABSTRACT
We observe asymmetric color filtering under unpolarized incidence in a structured metallic (Ag) film, where the center of an optically thick circular Ag disk surrounded by a step gap appears dark when observed from one side, and bright from the other. The latter situation corresponds to abnormally high optical transmission through the optically thick film. We explain this by a three-step process: coupling of photons to surface plasmon polaritons (SPPs), wave interference of SPPs forming resonant cavity modes, and out-coupling from SPPs to photons. Full wave electromagnetic simulations based on the finite element method support our findings. These results may have potential applications in areas such as optical color filtering and biosensing via dielectric detection within the step gap plasmonic cavity.

No MeSH data available.


Related in: MedlinePlus

Transmission (T) spectrum of the “reverse halo”.Transmission spectrum of the same circular step gap structure as in Fig. (4) under the same illumination condition, with incident wavelength swept from 450 nm to 750 nm.
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f6: Transmission (T) spectrum of the “reverse halo”.Transmission spectrum of the same circular step gap structure as in Fig. (4) under the same illumination condition, with incident wavelength swept from 450 nm to 750 nm.

Mentions: Figure 6 shows the transmission spectrum of the same circular structure as in Fig. 4, under the same illumination condition with incident wavelength swept from 450 to 750 nm. The sharp transmission peak at around 490 nm corresponds to the bright center mode shown in Fig. 4. As analyzed in detail in Ref. 11, the side wall length of the step-gap structure, together with the radius of the circular cavity, determine the spectral response of the device over the visible range. The two transmission minima between 550 to 600 nm are caused by SPP drumhead modes within the circular step gap11.


Structured metal thin film as an asymmetric color filter: the forward and reverse plasmonic halos.

Ye F, Burns MJ, Naughton MJ - Sci Rep (2014)

Transmission (T) spectrum of the “reverse halo”.Transmission spectrum of the same circular step gap structure as in Fig. (4) under the same illumination condition, with incident wavelength swept from 450 nm to 750 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4248275&req=5

f6: Transmission (T) spectrum of the “reverse halo”.Transmission spectrum of the same circular step gap structure as in Fig. (4) under the same illumination condition, with incident wavelength swept from 450 nm to 750 nm.
Mentions: Figure 6 shows the transmission spectrum of the same circular structure as in Fig. 4, under the same illumination condition with incident wavelength swept from 450 to 750 nm. The sharp transmission peak at around 490 nm corresponds to the bright center mode shown in Fig. 4. As analyzed in detail in Ref. 11, the side wall length of the step-gap structure, together with the radius of the circular cavity, determine the spectral response of the device over the visible range. The two transmission minima between 550 to 600 nm are caused by SPP drumhead modes within the circular step gap11.

Bottom Line: We explain this by a three-step process: coupling of photons to surface plasmon polaritons (SPPs), wave interference of SPPs forming resonant cavity modes, and out-coupling from SPPs to photons.Full wave electromagnetic simulations based on the finite element method support our findings.These results may have potential applications in areas such as optical color filtering and biosensing via dielectric detection within the step gap plasmonic cavity.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA.

ABSTRACT
We observe asymmetric color filtering under unpolarized incidence in a structured metallic (Ag) film, where the center of an optically thick circular Ag disk surrounded by a step gap appears dark when observed from one side, and bright from the other. The latter situation corresponds to abnormally high optical transmission through the optically thick film. We explain this by a three-step process: coupling of photons to surface plasmon polaritons (SPPs), wave interference of SPPs forming resonant cavity modes, and out-coupling from SPPs to photons. Full wave electromagnetic simulations based on the finite element method support our findings. These results may have potential applications in areas such as optical color filtering and biosensing via dielectric detection within the step gap plasmonic cavity.

No MeSH data available.


Related in: MedlinePlus