Thermally stable AgCu alloy disc array for near infrared filters

Hyeong Seop Im, Kee Baek Sim, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the thermal and optical characteristics of AgCu alloy disc (250 and 380 nm in diameter) arrays to produce an optical filter with low near infrared (NIR) transmittance, and compared their properties with those of Ag disc array. Unlike the Ag discs, the AgCu discs remained relatively stable with hillocks after annealing at 500 °C. The Ag and AgCu disc samples had similar transmittance characteristics, showing a global minimum at ~767 nm (for the 250 nm-disc samples) and at ~1081 nm (for the 380 nm-disc samples). Based on finite-difference time-domain (FDTD) simulations, the global minimum was related to localised surface plasmon resonance (LSPR). The Maxwell-Garnett model was employed to interpret the red-shift of the transmittance minima. The calculations showed that a mixture of agglomerated and stable Ag discs, resulting in different n and k values, would be responsible for the red-shift and an increase in the minimum transmittance.

Original languageEnglish
Pages (from-to)1321-1327
Number of pages7
JournalCurrent Applied Physics
Volume20
Issue number12
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • AgCu alloy
  • Finite-difference time-domain simulation
  • Infrared filter
  • Localised surface plasmon
  • Nanodisc array
  • Nanoimprint lithography

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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