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An Analog of electrically induced transparency via surface delocalized modes.

Xiao X, Zhou B, Wang X, He J, Hou B, Zhang Y, Wen W - Sci Rep (2015)

Bottom Line: We demonstrate theoretically and experimentally an interesting opaque state, which is based on an analog of electromagnetically induced transparency (EIT) in mechanism, in a metal hole array of the dimer lattice.By introducing a small difference to the dimer holes of each unit cell, the surface delocalized modes launching out from the dimer holes can have destructive interferences.This surface-mode-induced opacity (SMIO) state is very sensitive to the difference of the dimer holes, which will promise various applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

ABSTRACT
We demonstrate theoretically and experimentally an interesting opaque state, which is based on an analog of electromagnetically induced transparency (EIT) in mechanism, in a metal hole array of the dimer lattice. By introducing a small difference to the dimer holes of each unit cell, the surface delocalized modes launching out from the dimer holes can have destructive interferences. Consequently, a narrow opaque window in the transparent background can be observed in the transmission spectrum. This surface-mode-induced opacity (SMIO) state is very sensitive to the difference of the dimer holes, which will promise various applications.

No MeSH data available.


Related in: MedlinePlus

(a) The dependence of the SMIO state on the center-center distance of the two dimer holes g: in the three cases shown, the dielectric constants of the two dimer holes are respectively ε1 = 1.21, ε2 = 1; (b) The dependence of the SMIO state on the difference of the dielectric constants of the two dimer holes Δε = ε1–ε2: in the three cases shown, the center-center distance of the two dimer holes is g = 0.5d. In all these results, the angle between the long sides of the holes and the polarization direction of the electric field is α = 50°.
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f4: (a) The dependence of the SMIO state on the center-center distance of the two dimer holes g: in the three cases shown, the dielectric constants of the two dimer holes are respectively ε1 = 1.21, ε2 = 1; (b) The dependence of the SMIO state on the difference of the dielectric constants of the two dimer holes Δε = ε1–ε2: in the three cases shown, the center-center distance of the two dimer holes is g = 0.5d. In all these results, the angle between the long sides of the holes and the polarization direction of the electric field is α = 50°.

Mentions: Due to the properties of interference, the SMIO state is sensitive to the center-center distance g of the dimer holes (denoted in the inset of Fig. 3(a)). As the decrement of g, the width of the interference region decreases, so the SMIO state shifts to the short wavelength direction (see Fig. 4(a)). We also notice that the transmittance at the SMIO state has a very small change as the decrement of g. This illustrates that the robustness of SMIO state does not depend on the distance between the resonant elements. On the other hand, the difference in the electromagnetic property of the dimer holes is also relevant to the appearance of the destructive interference. To demonstrate it properly, we fix ε2 as 1 and tune the value of ε1. We find that as the decrement of the difference Δε = ε1–ε2, the transmittance at the SMIO state becomes larger and larger (see Fig. 4(b)), which indicates that the SMIO state becomes weaker and weaker. However, we have to note that even when the difference of the dielectric constant is as low as Δε = 0.01, an obvious transmission dip can be identified, which implies potential sensor applications.


An Analog of electrically induced transparency via surface delocalized modes.

Xiao X, Zhou B, Wang X, He J, Hou B, Zhang Y, Wen W - Sci Rep (2015)

(a) The dependence of the SMIO state on the center-center distance of the two dimer holes g: in the three cases shown, the dielectric constants of the two dimer holes are respectively ε1 = 1.21, ε2 = 1; (b) The dependence of the SMIO state on the difference of the dielectric constants of the two dimer holes Δε = ε1–ε2: in the three cases shown, the center-center distance of the two dimer holes is g = 0.5d. In all these results, the angle between the long sides of the holes and the polarization direction of the electric field is α = 50°.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4508561&req=5

f4: (a) The dependence of the SMIO state on the center-center distance of the two dimer holes g: in the three cases shown, the dielectric constants of the two dimer holes are respectively ε1 = 1.21, ε2 = 1; (b) The dependence of the SMIO state on the difference of the dielectric constants of the two dimer holes Δε = ε1–ε2: in the three cases shown, the center-center distance of the two dimer holes is g = 0.5d. In all these results, the angle between the long sides of the holes and the polarization direction of the electric field is α = 50°.
Mentions: Due to the properties of interference, the SMIO state is sensitive to the center-center distance g of the dimer holes (denoted in the inset of Fig. 3(a)). As the decrement of g, the width of the interference region decreases, so the SMIO state shifts to the short wavelength direction (see Fig. 4(a)). We also notice that the transmittance at the SMIO state has a very small change as the decrement of g. This illustrates that the robustness of SMIO state does not depend on the distance between the resonant elements. On the other hand, the difference in the electromagnetic property of the dimer holes is also relevant to the appearance of the destructive interference. To demonstrate it properly, we fix ε2 as 1 and tune the value of ε1. We find that as the decrement of the difference Δε = ε1–ε2, the transmittance at the SMIO state becomes larger and larger (see Fig. 4(b)), which indicates that the SMIO state becomes weaker and weaker. However, we have to note that even when the difference of the dielectric constant is as low as Δε = 0.01, an obvious transmission dip can be identified, which implies potential sensor applications.

Bottom Line: We demonstrate theoretically and experimentally an interesting opaque state, which is based on an analog of electromagnetically induced transparency (EIT) in mechanism, in a metal hole array of the dimer lattice.By introducing a small difference to the dimer holes of each unit cell, the surface delocalized modes launching out from the dimer holes can have destructive interferences.This surface-mode-induced opacity (SMIO) state is very sensitive to the difference of the dimer holes, which will promise various applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

ABSTRACT
We demonstrate theoretically and experimentally an interesting opaque state, which is based on an analog of electromagnetically induced transparency (EIT) in mechanism, in a metal hole array of the dimer lattice. By introducing a small difference to the dimer holes of each unit cell, the surface delocalized modes launching out from the dimer holes can have destructive interferences. Consequently, a narrow opaque window in the transparent background can be observed in the transmission spectrum. This surface-mode-induced opacity (SMIO) state is very sensitive to the difference of the dimer holes, which will promise various applications.

No MeSH data available.


Related in: MedlinePlus