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Polarized light emitting diodes using silver nanoellipsoids

Örs Sepsi, Tibor Gál, and Pál Koppa

Open Access Open Access

Abstract

We investigate the polarizing properties of periodic array of silver nanoellipsoids placed on top of a planar LED structure. The response of the particles is calculated with the periodic layered Green’s tensor in the electrostatic limit with dynamic depolarization and radiation damping corrections. We investigate the degree of polarization and the total extracted power spectra depending on parameters like lattice period, axial ratio and particle size. The proposed model is applicable over a wide range of parameters and appropriate to optimize the given structure. The optimization procedure shows that particles in the size range of 100 nm are optimal to reach 50% degree of polarization and less than 15% absorbance for an uncollimated and unpolarized dipole source.

© 2014 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Geometry of the investigated planar LED structure with silver nanoellipsoids on top.

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Fig. 2
Fig. 2 Degree of polarization (top left), transmittance (top right), absorbance (bottom left) and reflectance (bottom right) spectra of periodic array of silver nanospheroids placed on an LED chip. The major semi-axis values are presented in the legend of the figure, the AR is constant 2 and the period of the lattice is 2lx + 5 nm.

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Fig. 3
Fig. 3 Degree of polarization (left) and absorbance (right) spectra of periodic array of silver nanospheroids placed on an LED chip. The major semi-axis was lx = 25 nm, the axial ratio was equal to 2. The lattice period is presented in the legend of the figure.

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Fig. 4
Fig. 4 DOP, absorbance, transmittance and reflectance at 620 nm as function of particle semi-major axis. The axial ratio was equal to 2.2, the period was p = 2.1lx.

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Equations (6)

Equations on this page are rendered with MathJax. Learn more.

p = ε h α ̳ E ( r 0 ) ,
α ̳ i j = 4 π l x l y l z 3 ε p − ε h ε h + L i ( ε p − ε h ) δ i j ,
α ˜ ̳ i j = α ̳ i j     ( 1 − k h 2 4 π l i α ̳ i j − i 1 6 π k h 3 α ̳ i j )   − 1 ,
E ( r ) = E inc ( r ) + ω 2 μ 0 ∑ j G ̳ ( r , r j ) p j ,
p j = e i K ( r j − r 0 )     ( I ̳ − ε h α ˜ ̳ ω 2 μ 0 G ̳ lat ( r 0 ) ) − 1 ε h α ˜ ̳ E inc ( r 0 ) ,
G ̳ lat ( r 0 ) = ∑ j ′ G ̳ ( r 0 , r j ) e i K ( r j − r 0 ) .
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