Browsing by Author "Dong, Liangliang"

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    Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
    (2020-03-19) Dong, Liangliang; Halas, Naomi
    Surface plasmon – the electromagnetic interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers studied the dependence of plasmon resonance frequency on the size, shape and dielectric environment of the nanoscale system, mainly for sensing applications. The intense and localized field, generated by two adjacent metallic nanostructures when appropriately illuminated, has been utilized for enhancing the sensitivity of vibrational spectroscopy. The near-field enhancement is also responsible for benefiting device properties, such as improving nonlinear frequency conversion efficiency. In this thesis, I will present plasmonic structures with interesting optical properties and discuss their applications in infrared spectroscopy, refractive index sensing and subwavelength nonlinear optics.
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    Harmonic light-generating metasurface
    (2022-11-15) Semmlinger, Michael; Tseng, Ming-lun; Yang, Jian; Zhang, Ming; Tsai, Din Ping; Dong, Liangliang; Ahmadivand, Arash; Nordlander, Peter; Halas, Naomi Jean; Rice University; William Marsh Rice University; Academia Sinica; United States Patent and Trademark Office
    A harmonic light-generating metasurface includes a base substrate and a plurality of structures, that include nonlinear material, that are disposed in a pattern on a surface of the base substrate. Each structure of the plurality of structures individually supports a magnetic dipole mode. An electromagnetic field enhancement of the magnetic dipole mode induces generation of a harmonic signal by the plurality of structures. Alternatively, a harmonic light-generating metasurface, includes a base substrate, a supporting substrate that includes a nonlinear material, and a plurality of paired structures disposed in a pattern on a surface of the supporting substrate. Each paired structure, of the plurality of paired structures, collectively supports a toroidal dipole mode. An electromagnetic field enhancement of the toroidal dipole mode penetrates the supporting substrate to induce generation of a harmonic signal by the supporting substrate.
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    Toroidal Dipole-Enhanced Third Harmonic Generation of Deep Ultraviolet Light Using Plasmonic Meta-atoms
    (American Chemical Society, 2019) Ahmadivand, Arash; Semmlinger, Michael; Dong, Liangliang; Gerislioglu, Burak; Nordlander, Peter; Halas, Naomi J.; Laboratory for Nanophotonics
    The harmonic generation of light with plasmonic and all-dielectric nanostructures has gained much recent interest. This approach is especially promising for short wavelength (i.e., ultraviolet (UV)) generation, where conventional nonlinear crystals reach their limits both in transparency and in their ability to achieve phase-matching between the input and output fields. Here, we demonstrate that the third harmonic generation of deep UV light in an indium tin oxide (ITO) film can be substantially enhanced by a metasurface consisting of metallic toroidal meta-atoms covered with an alumina layer for protection against laser-induced damage. This approach combines the benefits of the large nonlinear susceptibility of ITO with the unique field enhancement properties of a toroidal metasurface. This ITO–meta-atom combination produces a third harmonic signal at a wavelength of 262 nm that is nominally five times larger than that of an ITO film patterned with a conventional hotspot-enhanced plasmonic dimer array. This result demonstrates the potential for toroidal meta-atoms as the active engineered element in a new generation of enhanced nonlinear optical materials and devices.