Negative Curvature Fibers
Hollow-core negative curvature fibers using the antiresonance guiding mechanism have a low transmission loss and a wide transmission bandwidth. The simple negative curvature structure could be used to fabricate fiber devices using non-silica glasses, such as chalcogenide, for mid-IR applications.

Reference:C. Wei, R. J. Weiblen, C. R. Menyuk, and J. Hu, “Negative curvature fibers,” Adv. Opt. Photon. 9, 504–561 (2017). (impact factor: 17.8)
2-D materials
2D Materials, or single layer materials, are materials consisting of a single layer of atoms. Due to their unusual characteristics, 2D materials have applications such as photovoltaics, semiconductors, electrodes and water purification.

F. Lin, Z. Zhu, X. Zhou, W. Qiu, C. Niu, J. Hu, Y. Wang, Z. Zhao, D. Litvinov, Z. Liu, Z. M. Wang, and J. Bao, “Orientation control of graphene flakes by magnetic field: broad device applications of macroscopically aligned graphene,”  Adv. Mater. 29, 1604453 (2017). (impact factor: 19.8)

C. Niu, F. Lin, Z. M. Wang, J. Bao, and J. Hu, “Graphene levitation and orientation control using a magnetic field,” J. Appl. Phys. 123, 044302 (2018). (Editor’s Pick)

Nanophotonics and metamaterials
Nanophotonics is the study of the behavior of light on the nanometer scale. Our interest is to design different structures for photovoltaic and biomedical application. We will also investigate different metamaterials with negative refractive index.
Reference:W. Li, F. Ding, J. Hu, and S. Y. Chou, “Three-dimensional cavity nanoantenna coupled plasmonic nanodots for ultrahigh and uniform surface-enhanced Raman scattering over large area,” Opt. Express 18, 3925C-3936 (2011)
Mid-IR supercontinuum generation
Photonic crystal fibers (PCFs) are the fibers with small and regrularly spaced air holes that go along the entire length of the fiber. We will use supercontinuum generation to generate broad mid-IR light source using chalcogenide PCF. Obtaining a broad bandwidth light source requires a careful choice of the fibers waveguide parameters and the pulses peak power and duration, which determine respectively the fibers dispersion and nonlinearity.

Reference: J. Hu, C. R. Menyuk, L. B. Shaw, J. S. Sanghera, and I. D. Aggarwal, “Maximizing the bandwidth of supercontinuum generation in As2Se3 chalcogenide fibers,” Opt. Express 18, 6722–6739 (2010).
Optical quantum communications
Optical quantum communications, in particular, hold promise for classically-unparalleled communication protocols, such as quantum key distribution, quantum teleportation, symmetrically secure database queries, and quantum games. Quantum optical Fredkin gate is an indispensable resource for networkable quantum applications. Using a Sagnac fiber-loop switch as a specific example, we show that high switching contrast can be maintained even in the presence of significant pump fluctuations.
Reference:  J. Hu, Y.-P. Huang, and P. Kumar “Self-stabilized Quantum Optical Fredkin Gate,” Opt. Lett. 38, 522-524 (2013).

Software: UndStdLeakyMode

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