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• W3101728612 abstract "Transparent conducting oxides have recently gained great attention as CMOS-compatible materials for applications in nanophotonics due to their low optical loss, metal-like behavior, versatile/tailorable optical properties, and established fabrication procedures. In particular, aluminum doped zinc oxide (AZO) is very attractive because its dielectric permittivity can be engineered over a broad range in the near infrared and infrared. However, despite all these beneficial features, the slow (> 100 ps) electron-hole recombination time typical of these compounds still represents a fundamental limitation impeding ultrafast optical modulation. Here we report the first epsilon-near-zero AZO thin films which simultaneously exhibit ultra-fast carrier dynamics (excitation and recombination time below 1 ps) and an outstanding reflectance modulation up to 40% for very low pump fluence levels (< 4 mJ/cm2) at the telecom wavelength of 1.3 {mu}m. The unique properties of the demonstrated AZO thin films are the result of a low temperature fabrication procedure promoting oxygen vacancies and an ultra-high carrier concentration. As a proof-of-concept, an all-optical AZO-based plasmonic modulator achieving 3 dB modulation in 7.5 {mu}m and operating at THz frequencies is numerically demonstrated. Our results overcome the traditional modulation depth vs. speed trade-off by at least an order of magnitude, placing AZO among the most promising compounds for tunable/switchable nanophotonics." @default.
• W3101728612 created "2020-11-23" @default.
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• W3101728612 date "2015-07-02" @default.
• W3101728612 modified "2023-10-16" @default.
• W3101728612 title "Epsilon-near-zero Al-doped ZnO for ultrafast switching at telecom wavelengths" @default.
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• W3101728612 doi "https://doi.org/10.1364/optica.2.000616" @default.
• W3101728612 hasPublicationYear "2015" @default.
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