Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep27700
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Funding
- EPSRC [EP/J004200/1]
- European Research Council under the European Union Seventh Framework Programme (FP)/ERC [GA 306559]
- EPSRC (UK) [EP/J00443X/1]
- European Union [GA 627478, GA 299522]
- U.S. Army International Technology Center Atlantic [W911NF-14-1-0315]
- Engineering and Physical Sciences Research Council [EP/J004200/1, EP/J015040/1, EP/J00443X/1] Funding Source: researchfish
- EPSRC [EP/J015040/1, EP/J00443X/1, EP/J004200/1, EP/M009122/1] Funding Source: UKRI
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Epsilon-Near-Zero materials exhibit a transition in the real part of the dielectric permittivity from positive to negative value as a function of wavelength. Here we study metal-dielectric layered metamaterials in the homogenised regime (each layer has strongly subwavelength thickness) with zero real part of the permittivity in the near-infrared region. By optically pumping the metamaterial we experimentally show that close to the Epsilon-Near-Zero (ENZ) wavelength the permittivity exhibits a marked transition from metallic (negative permittivity) to dielectric (positive permittivity) as a function of the optical power. Remarkably, this transition is linear as a function of pump power and occurs on time scales of the order of the 100 fs pump pulse that need not be tuned to a specific wavelength. The linearity of the permittivity increase allows us to express the response of the metamaterial in terms of a standard third order optical nonlinearity: this shows a clear inversion of the roles of the real and imaginary parts in crossing the ENZ wavelength, further supporting an optically induced change in the physical behaviour of the metamaterial.
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