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4 March 2019 Physics and applications of epsilon-near-zero materials (Conference Presentation)
Robert W. Boyd
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Proceedings Volume 10922, Smart Photonic and Optoelectronic Integrated Circuits XXI; 1092207 (2019) https://doi.org/10.1117/12.2513710
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
This talk begins with a description of how the properties of light become modified for propagation through a material for which the dielectric permittivity epsilon is nearly vanishing. In such a situation, the refractive index also nearly vanishes, and thus both the wavelength of light and the phase velocity of light become nearly infinite. Radiative processes also are strongly modified, with both the Einstein A and B coefficients being dependent on the refractive index of the material. We have recently found that nonlinear optical properties tend to be strongly enhanced in epsilon-near-zero (ENZ) materials [1]. For the case of indium-tin-oxide (ITO), we measured a huge value (10^6 times larger than that of fused silica) of the nonlinear coefficient n_2. In subsequent work, we have fabricated a metasurface consisting of gold nanorods on an ITO substrate, and we have found that the nonlinear coefficient is further enhanced and can be controlled in both magnitude and sign [2]. The talk then turns to a discussion of the implications of the use of ENZ materials as a platform for applications in the field of nanophotonics. 1. Large optical nonlinearity of indium tin oxide in its epsilon-near-zero region, M. Z. Alam, I. D. Leon, and R. W. Boyd, Science 352, 795 (2016).  2. Large optical nonlinearity of nanoantennas coupled to an epsilon-near-zero material, M. Z. Alam, S. A. Schulz, J. Upham, I. De Leon and R. W. Boyd, Nature Photonics,12 79-83 (2018). 
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Robert W. Boyd "Physics and applications of epsilon-near-zero materials (Conference Presentation)", Proc. SPIE 10922, Smart Photonic and Optoelectronic Integrated Circuits XXI, 1092207 (4 March 2019); https://doi.org/10.1117/12.2513710
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KEYWORDS
Physics
Nonlinear optics
Refractive index
Dielectrics
Gold
Light wave propagation
Nanophotonics
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