Asymmetric Dichroic Colors in Stretchable Film with Embedded Au/Ag Alloy Nanoparticles

Sunghwan Jo, Ju Yeon Woo, Jun Ho Oh, Chang Woo Song, Hee Min Yang, Chang Soo Han

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We present a new type of stretchable dichroic film in which Au and Ag alloy nanoparticles (NPs) are dispersed in polydimethylsiloxane (PDMS). The alloy NPs are synthesized with different atomic compositions and sizes to modulate their plasmonic resonance frequencies and absorption and scattering cross sections. The PDMS dichroic film in which 100 nm alloy NPs with a Au/Ag ratio of 7:3 are dispersed shows exotic optical properties under tensile strain. When 40% tensile strain is applied, the film exhibits a strain-sensitive transmission and strain-insensitive reflection behavior in which the transmittance is increased up to 2.6 times, whereas the reflectance remains unchanged. Moreover, we demonstrate a stretchable anticounterfeiting film and a flexible dichroic sculpture fabricated with the PDMS composite. This work demonstrates a new type of plasmonic application that has great potential in various applications, such as special-purpose optical films, security patterns, and smart windows.

Original languageEnglish
Pages (from-to)23734-23742
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number20
Publication statusPublished - 2022 May 25


  • alloy nanoparticle
  • dichroic color
  • Lycurgus Cup
  • stretchable optical film
  • stretchable plasmonics

ASJC Scopus subject areas

  • Materials Science(all)


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