Enhanced light-extraction from a GaN waveguide using micro-pillar TiO 2-SiO2 graded-refractive-index layers

Frank W. Mont; Arthur J. Fischer; Ahmed N. Noemaun; David J. Poxson; Jaehee Cho; E. Fred Schubert; Mary H. Crawford; Daniel D. Koleske; Kristine W. Fullmer

doi:10.1002/pssa.201228295

Enhanced light-extraction from a GaN waveguide using micro-pillar TiO ₂-SiO₂ graded-refractive-index layers

Frank W. Mont^*
, Arthur J. Fischer
, Ahmed N. Noemaun
, David J. Poxson
, Jaehee Cho
, E. Fred Schubert
, Mary H. Crawford
, Daniel D. Koleske
, Kristine W. Fullmer

^*Corresponding author for this work

Department of Semiconductor Science and Technology

Rensselaer Polytechnic Institute
Sandia National Laboratories, New Mexico

Research output: Contribution to journal › Journal article › peer-review

2 Scopus citations

Abstract

A GaN waveguide structure with micro-pillar arrays is designed and fabricated to measure the extraction of optical modes that would be waveguided in the absence of the pillars. Electroluminescence (EL) measurements of waveguide light-emitting diodes (LEDs) with pillar diameters in the 2-10 μm range revealed increasing light-extraction efficiency (LEE) enhancement with decreasing pillar diameter. Ray tracing simulations of LED far-field patterns confirmed experimental trends. A 54% enhancement is demonstrated for GaN waveguides cladded with a triangular lattice of graded-refractive-index (GRIN) TiO₂-SiO₂ micro-pillars of 2 μm diameters compared to GaN waveguides cladded with an unpatterned GRIN TiO₂-SiO₂ layer.

Original language	English
Pages (from-to)	2277-2280
Number of pages	4
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	209
Issue number	11
DOIs	https://doi.org/10.1002/pssa.201228295
State	Published - 2012.11

Keywords

GaN
GRIN
light-extraction
micro-pillars

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10.1002/pssa.201228295

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Mont, F. W., Fischer, A. J., Noemaun, A. N., Poxson, D. J., Cho, J., Schubert, E. F., Crawford, M. H., Koleske, D. D., & Fullmer, K. W. (2012). Enhanced light-extraction from a GaN waveguide using micro-pillar TiO ₂-SiO₂ graded-refractive-index layers. Physica Status Solidi (A) Applications and Materials Science, 209(11), 2277-2280. https://doi.org/10.1002/pssa.201228295

@article{4067e79478d0470786c966287c711fa4,

title = "Enhanced light-extraction from a GaN waveguide using micro-pillar TiO 2-SiO2 graded-refractive-index layers",

abstract = "A GaN waveguide structure with micro-pillar arrays is designed and fabricated to measure the extraction of optical modes that would be waveguided in the absence of the pillars. Electroluminescence (EL) measurements of waveguide light-emitting diodes (LEDs) with pillar diameters in the 2-10 μm range revealed increasing light-extraction efficiency (LEE) enhancement with decreasing pillar diameter. Ray tracing simulations of LED far-field patterns confirmed experimental trends. A 54\% enhancement is demonstrated for GaN waveguides cladded with a triangular lattice of graded-refractive-index (GRIN) TiO2-SiO2 micro-pillars of 2 μm diameters compared to GaN waveguides cladded with an unpatterned GRIN TiO2-SiO2 layer.",

keywords = "GaN, GRIN, light-extraction, micro-pillars",

author = "Mont, \{Frank W.\} and Fischer, \{Arthur J.\} and Noemaun, \{Ahmed N.\} and Poxson, \{David J.\} and Jaehee Cho and Schubert, \{E. Fred\} and Crawford, \{Mary H.\} and Koleske, \{Daniel D.\} and Fullmer, \{Kristine W.\}",

year = "2012",

month = nov,

doi = "10.1002/pssa.201228295",

language = "English",

volume = "209",

pages = "2277--2280",

journal = "Physica Status Solidi (A) Applications and Materials Science",

issn = "1862-6300",

number = "11",

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TY - JOUR

T1 - Enhanced light-extraction from a GaN waveguide using micro-pillar TiO 2-SiO2 graded-refractive-index layers

AU - Mont, Frank W.

AU - Fischer, Arthur J.

AU - Noemaun, Ahmed N.

AU - Poxson, David J.

AU - Cho, Jaehee

AU - Schubert, E. Fred

AU - Crawford, Mary H.

AU - Koleske, Daniel D.

AU - Fullmer, Kristine W.

PY - 2012/11

Y1 - 2012/11

N2 - A GaN waveguide structure with micro-pillar arrays is designed and fabricated to measure the extraction of optical modes that would be waveguided in the absence of the pillars. Electroluminescence (EL) measurements of waveguide light-emitting diodes (LEDs) with pillar diameters in the 2-10 μm range revealed increasing light-extraction efficiency (LEE) enhancement with decreasing pillar diameter. Ray tracing simulations of LED far-field patterns confirmed experimental trends. A 54% enhancement is demonstrated for GaN waveguides cladded with a triangular lattice of graded-refractive-index (GRIN) TiO2-SiO2 micro-pillars of 2 μm diameters compared to GaN waveguides cladded with an unpatterned GRIN TiO2-SiO2 layer.

AB - A GaN waveguide structure with micro-pillar arrays is designed and fabricated to measure the extraction of optical modes that would be waveguided in the absence of the pillars. Electroluminescence (EL) measurements of waveguide light-emitting diodes (LEDs) with pillar diameters in the 2-10 μm range revealed increasing light-extraction efficiency (LEE) enhancement with decreasing pillar diameter. Ray tracing simulations of LED far-field patterns confirmed experimental trends. A 54% enhancement is demonstrated for GaN waveguides cladded with a triangular lattice of graded-refractive-index (GRIN) TiO2-SiO2 micro-pillars of 2 μm diameters compared to GaN waveguides cladded with an unpatterned GRIN TiO2-SiO2 layer.

KW - GaN

KW - GRIN

KW - light-extraction

KW - micro-pillars

UR - https://www.scopus.com/pages/publications/84869853120

U2 - 10.1002/pssa.201228295

DO - 10.1002/pssa.201228295

M3 - Journal article

AN - SCOPUS:84869853120

SN - 1862-6300

VL - 209

SP - 2277

EP - 2280

JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

IS - 11

ER -

Enhanced light-extraction from a GaN waveguide using micro-pillar TiO ₂-SiO₂ graded-refractive-index layers

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Keywords

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