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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 transmission spectra through metal hole array of dimer lattice: the black solid curve is for the case that two dimer holes in each unit cell have different dielectric constants (ε1 = 1.21, ε2 = 1); the blue dash curve is for the case that the two dimer holes have the same dielectric constant (ε1 = 1, ε2 = 1). (b) The transmission spectra through metal hole array of single lattice: the red dash-dot line is for the case that the dielectric constant of the hole is ε = ε1 = 1.21, and the blue dash line is for the case that the dielectric constant of the hole is ε = ε1 = 1. As it is shown in the inset, the lattice constant is d, the center-center distance of the two dimer holes is g = 0.5d, and the long sides of the rectangular holes have an angle α = 50° from the polarization direction of the electric field. In the unit of frequency, ω is the angular frequency, c is the velocity of light in vacuum.
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f1: (a) The transmission spectra through metal hole array of dimer lattice: the black solid curve is for the case that two dimer holes in each unit cell have different dielectric constants (ε1 = 1.21, ε2 = 1); the blue dash curve is for the case that the two dimer holes have the same dielectric constant (ε1 = 1, ε2 = 1). (b) The transmission spectra through metal hole array of single lattice: the red dash-dot line is for the case that the dielectric constant of the hole is ε = ε1 = 1.21, and the blue dash line is for the case that the dielectric constant of the hole is ε = ε1 = 1. As it is shown in the inset, the lattice constant is d, the center-center distance of the two dimer holes is g = 0.5d, and the long sides of the rectangular holes have an angle α = 50° from the polarization direction of the electric field. In the unit of frequency, ω is the angular frequency, c is the velocity of light in vacuum.

Mentions: Metal hole array (MHA) of dimer lattice is schematically shown in the inset of Fig. 1(a). By its definition, the dimer lattice means that there are two rectangular holes in one unit cell. In the structure the longer sides of rectangular holes are parallel. The light is shining on the structure normally with the electric field polarized in the direction perpendicular to the line linking the centers of the two rectangular holes (see the inset of Fig. 1(a)). As long as the incident light can illuminate the holes, the orientation of the holes is not important32. Without losing generality, we assume that the longer sides tilt an angle α = 50° from the direction of the incident electric field (see the insets in Fig. 1). By using the mode expansion method323435, we calculate the transmission spectra. As it is shown in Fig. 1(a), comparing to the transmission spectrum (the blue dash line) of MHA of identical dimer holes (ε1 = ε2 = 1), a small difference in the dielectric constants of the dimer holes (ε1 = 1.21, ε2 = 1) leads to an EIT-like spectrum (black curve in Fig. 1(a)): a sharp transmission dip is sandwiched between two transmission peaks. We find that the positions of the transmission peaks in the EIT-like spectrum are almost identical to those of the transmission peaks through single-hole arrays (Fig. 1(b)). This observation illustrates that the lower transmission peak of the EIT-like spectrum is obtained by the resonance of ε1 = 1.21 holes in the dimer hole array, while the peak in the higher frequency is caused by ε2 = 1 holes. The opaque state between the two peaks is a result of somehow hybridization of the two resonance.


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 transmission spectra through metal hole array of dimer lattice: the black solid curve is for the case that two dimer holes in each unit cell have different dielectric constants (ε1 = 1.21, ε2 = 1); the blue dash curve is for the case that the two dimer holes have the same dielectric constant (ε1 = 1, ε2 = 1). (b) The transmission spectra through metal hole array of single lattice: the red dash-dot line is for the case that the dielectric constant of the hole is ε = ε1 = 1.21, and the blue dash line is for the case that the dielectric constant of the hole is ε = ε1 = 1. As it is shown in the inset, the lattice constant is d, the center-center distance of the two dimer holes is g = 0.5d, and the long sides of the rectangular holes have an angle α = 50° from the polarization direction of the electric field. In the unit of frequency, ω is the angular frequency, c is the velocity of light in vacuum.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: (a) The transmission spectra through metal hole array of dimer lattice: the black solid curve is for the case that two dimer holes in each unit cell have different dielectric constants (ε1 = 1.21, ε2 = 1); the blue dash curve is for the case that the two dimer holes have the same dielectric constant (ε1 = 1, ε2 = 1). (b) The transmission spectra through metal hole array of single lattice: the red dash-dot line is for the case that the dielectric constant of the hole is ε = ε1 = 1.21, and the blue dash line is for the case that the dielectric constant of the hole is ε = ε1 = 1. As it is shown in the inset, the lattice constant is d, the center-center distance of the two dimer holes is g = 0.5d, and the long sides of the rectangular holes have an angle α = 50° from the polarization direction of the electric field. In the unit of frequency, ω is the angular frequency, c is the velocity of light in vacuum.
Mentions: Metal hole array (MHA) of dimer lattice is schematically shown in the inset of Fig. 1(a). By its definition, the dimer lattice means that there are two rectangular holes in one unit cell. In the structure the longer sides of rectangular holes are parallel. The light is shining on the structure normally with the electric field polarized in the direction perpendicular to the line linking the centers of the two rectangular holes (see the inset of Fig. 1(a)). As long as the incident light can illuminate the holes, the orientation of the holes is not important32. Without losing generality, we assume that the longer sides tilt an angle α = 50° from the direction of the incident electric field (see the insets in Fig. 1). By using the mode expansion method323435, we calculate the transmission spectra. As it is shown in Fig. 1(a), comparing to the transmission spectrum (the blue dash line) of MHA of identical dimer holes (ε1 = ε2 = 1), a small difference in the dielectric constants of the dimer holes (ε1 = 1.21, ε2 = 1) leads to an EIT-like spectrum (black curve in Fig. 1(a)): a sharp transmission dip is sandwiched between two transmission peaks. We find that the positions of the transmission peaks in the EIT-like spectrum are almost identical to those of the transmission peaks through single-hole arrays (Fig. 1(b)). This observation illustrates that the lower transmission peak of the EIT-like spectrum is obtained by the resonance of ε1 = 1.21 holes in the dimer hole array, while the peak in the higher frequency is caused by ε2 = 1 holes. The opaque state between the two peaks is a result of somehow hybridization of the two resonance.

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