Design of out-coupling structures with metaldielectric surface relief

Sun Kyung Kim, Ho Seok Ee, Kyung Deok Song, Hong Kyu Park

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We propose an unconventional out-coupling structure consisting of two-dimensional periodic metal-dielectric patterns. Numerical simulations show that low orders of guided modes are extracted efficiently by the metal-dielectric pattern with a pitch size of ∼(λ/n) and pattern depth of <100 nm. Vertical GaN light-emitting diodes with optimized metal-ITO patterns exhibited extraction efficiencies enhanced by factors of 6.6 and 2.6 for perfect conductor and silver metals, respectively, as compared to a nonpatterned structure. The plasmonic absorption loss from the corrugated silver mirror accounts for the relatively smaller enhancement in extraction efficiency with the silver-ITO pattern. Furthermore, a double-sided outcoupling structure consisting of an upper GaN-air pattern and a bottom perfect conductor-ITO pattern exhibited a 40% enhancement in extraction efficiency as compared to the structure with single GaN-air pattern. We believe that deep understandings of the interaction between light and metaldielectric patterns will lead to improved device performances in various optoelectronic applications including high-efficiency light-emitting diodes.

Original languageEnglish
Pages (from-to)17230-17236
Number of pages7
JournalOptics Express
Volume20
Issue number15
DOIs
Publication statusPublished - 2012 Jul 16

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ITO (semiconductors)
silver
metals
light emitting diodes
conductors
augmentation
upper atmosphere
mirrors
air
simulation
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Design of out-coupling structures with metaldielectric surface relief. / Kim, Sun Kyung; Ee, Ho Seok; Song, Kyung Deok; Park, Hong Kyu.

In: Optics Express, Vol. 20, No. 15, 16.07.2012, p. 17230-17236.

Research output: Contribution to journalArticle

Kim, Sun Kyung ; Ee, Ho Seok ; Song, Kyung Deok ; Park, Hong Kyu. / Design of out-coupling structures with metaldielectric surface relief. In: Optics Express. 2012 ; Vol. 20, No. 15. pp. 17230-17236.
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