Large Transient Optical Modulation of Epsilon-Near-Zero Colloidal Nanocrystals

Benjamin T. Diroll; Peijun Guo; Robert P.H. Chang; Richard D. Schaller

doi:10.1021/acsnano.6b05116

Large Transient Optical Modulation of Epsilon-Near-Zero Colloidal Nanocrystals

Benjamin T. Diroll, Peijun Guo, Robert P.H. Chang, Richard D. Schaller

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

Epsilon-near-zero materials may be synthesized as colloidal nanocrystals which display large magnitude subpicosecond switching of infrared localized surface plasmon resonances. Such nanocrystals offer a solution-processable, scalable source of tunable metamaterials compatible with arbitrary substrates. Under intraband excitation, these nanocrystals display a red-shift of the plasmon feature arising from the low electron heat capacities and conduction band nonparabolicity of the oxide. Under interband pumping, they show in an ultrafast blueshift of the plasmon resonance due to transient increases in the carrier density. Combined with their high-quality factor, large changes in relative transmittance (+86%) and index of refraction (+85%) at modest control fluences (<5 mJ/cm²) suggest that these materials offer great promise for all-optical switching, wavefront engineering, and beam steering operating at terahertz switching frequencies.

Original language	English
Pages (from-to)	10099-10105
Number of pages	7
Journal	ACS nano
Volume	10
Issue number	11
DOIs	https://doi.org/10.1021/acsnano.6b05116
Publication status	Published - Nov 22 2016

Keywords

doping
epsilon-near-zero
localized surface plasmon resonance
nanocrystals
ultrafast

ASJC Scopus subject areas

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

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10.1021/acsnano.6b05116

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title = "Large Transient Optical Modulation of Epsilon-Near-Zero Colloidal Nanocrystals",

abstract = "Epsilon-near-zero materials may be synthesized as colloidal nanocrystals which display large magnitude subpicosecond switching of infrared localized surface plasmon resonances. Such nanocrystals offer a solution-processable, scalable source of tunable metamaterials compatible with arbitrary substrates. Under intraband excitation, these nanocrystals display a red-shift of the plasmon feature arising from the low electron heat capacities and conduction band nonparabolicity of the oxide. Under interband pumping, they show in an ultrafast blueshift of the plasmon resonance due to transient increases in the carrier density. Combined with their high-quality factor, large changes in relative transmittance (+86%) and index of refraction (+85%) at modest control fluences (<5 mJ/cm2) suggest that these materials offer great promise for all-optical switching, wavefront engineering, and beam steering operating at terahertz switching frequencies.",

keywords = "doping, epsilon-near-zero, localized surface plasmon resonance, nanocrystals, ultrafast",

author = "Diroll, {Benjamin T.} and Peijun Guo and Chang, {Robert P.H.} and Schaller, {Richard D.}",

note = "Funding Information: This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility under contract no. DE-AC02-06CH11357. P.G. and R.P.H.C. were funded by the MRSEC program (NSF DMR-1121262) at Northwestern University.",

year = "2016",

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