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Effects of the intermediate layer on polarized output of a light-emitting diode with surface plasmon coupling
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10.1063/1.3517082
/content/aip/journal/jap/108/11/10.1063/1.3517082
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3517082
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic drawing of the fabricated LED structure. CSL: current spreading layer; QW: quantum well.

Image of FIG. 2.
FIG. 2.

(a) Side-view drawing of the LED structure near the top showing the Ag grating pattern on a layer. The polar angle is defined. (b) Plan-view SEM image of Ag grating with the period at 500 nm on the top of an LED device. (c) Simulation window for the case with the intermediate layer.

Image of FIG. 3.
FIG. 3.

Emission intensity variations with injection current of various samples in the z [labeled by −(z)] and −z [labeled by −(−z)] directions, and their summations [labeled by −(t)].

Image of FIG. 4.
FIG. 4.

Ratios of the emission intensity in the −z direction, over that of the control sample (d), as functions of Ag grating period in samples A and B. Curve C shows the emission ratios of sample C at different wafer locations. The LED samples (A, B, C, and D) referring to the same abscissa point were fabricated nearby at the same radius of the epitaxial wafer.

Image of FIG. 5.
FIG. 5.

Spectra of the x and y polarization components, including the emissions in the z and −z directions, at 50 mA in injection current of samples A(550) (a) and B(500) (b).

Image of FIG. 6.
FIG. 6.

Angle-dependent intensity distributions of various polarization components of sample A(550) in the y-z (a) and x-z (b) planes. In each part, the -, -, x, y-polarized components, and the summation (labeled by t) of the - and -polarized components are shown.

Image of FIG. 7.
FIG. 7.

Comparisons of emission intensity, including the emissions in the z and −z directions, between samples , , and .

Image of FIG. 8.
FIG. 8.

Spectra of the x and y polarization components, including the emissions in the z and −z directions, at 50 mA in injection current of samples and .

Image of FIG. 9.
FIG. 9.

SPP dispersion curves in two zones for sample series A (dashed curves) and B (continuous curves). The light lines in GaN and are plotted as the dotted lines. The arrow indicates the energy level of QW emission.

Image of FIG. 10.
FIG. 10.

Simulated absorption spectra of a plane wave incident from the bottom in the z direction (curves labeled by z) and from the top in the −z direction (curves labeled by −z) onto Ag gratings of various periods fabricated on a GaN layer of infinite thickness.

Image of FIG. 11.
FIG. 11.

Simulated absorption spectra of a plane wave incident from the bottom in the z direction (curves labeled by z) and from the top in the −z direction (curves labeled by −z) onto Ag gratings of various periods fabricated on a layer of 30 nm in thickness, which is deposited on a GaN layer of infinite thickness.

Image of FIG. 12.
FIG. 12.

Simulated absorption spectra excited by a dipole directly below a single Ag stripe of various widths fabricated on a GaN layer of infinite thickness. The Ag stripe width corresponds to one-half the period, , of a grating.

Image of FIG. 13.
FIG. 13.

Simulated absorption spectra excited by a dipole directly below a single Ag stripe of various widths fabricated on a layer of 30 nm in thickness, which is deposited on a GaN layer of infinite thickness. The Ag stripe width corresponds to one-half the period, , of a grating.

Image of FIG. 14.
FIG. 14.

Simulated radiated power spectra with the single-stripe geometry in the z and −z directions [in the curves labeled by (z) and (−z), respectively] of the sample structures corresponding to sample A(550) and B(500).

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/content/aip/journal/jap/108/11/10.1063/1.3517082
2010-12-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of the intermediate SiO2 layer on polarized output of a light-emitting diode with surface plasmon coupling
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3517082
10.1063/1.3517082
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