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Tunable Mie resonances in silicon nanostructures probed with electron energy-loss spectroscopy
No full textIn this talk, I will present results on thermo-optic and electromechanical tuning of optical Mie resonances in high-refractive-index silicon nanostructures. Using in situ electron energy-loss spectroscopy, we show that the high thermo-optic coefficient of silicon enables tuning between the near field of Mie resonances supported by silicon nanoparticles in the visible. We also demonstrate an electromechanical platform composed of a silicon nanobeam dimer to electrically tune the optical response
Dynamically Tuneable Conducting Polymer Nanooptics
No full textI will present our recent research showing that organic conducting polymers can be used as a new type of materials for dynamically tuneable nanooptics, including chemically and electrically controlled plasmonic nanoantennas.1,2 References: 1. Conductive polymer nanoantennas for dynamic organic plasmonics S. Chen et al. Nature Nanotechnology 2020, 15, 35-40 2. Electrical Tuning of Plasmonic Conducting Polymer Nanoantennas A. Karki, et al. Advanced Materials 2022, 210717
Integral equations for metasurface design
No full textAmong the different ways to solve Maxwell’s equations, integral-equation approaches are probably offering the most physical insight. They allow the prediction of surface waves and their transformation into leaky waves. We will explain how integral equations can be turned into a direct design tool, beyond traditional field analysis. This allows the design of metasurfaces with prescribed radiation patterns, as well as the creation of multi-beam metasurfaces. Such a perspective on numerical methods may also serve other fields of engineering
THz Range Perforated Metasurface-integrated Multiband Fabry-Perot Microstrip Patch Antenna
No full textWe have proposed a THz range, multi-band, metasurface-integrated Fabry- Perot cavity antenna. The perforated single layer metasurface provides 40% wide stop bandwidth and it is used as superstrate. The metasurface integrated antenna resonates at the frequencies of 180.0 GHz, 189.46 GHz, 199.02 GHz and 208.82 GHz. The maximum peak gain of 13 dBi is at 189.46 GHz among the four bands. Nearly 5% of gain enhancement is achieved in all four bands after loading the metasurface on the antenna
On the propagation of surface plasmon polaritons at the interface of low-dimensional acoustic metamaterials
No full textAcoustic metamaterials and phononic crystals possess a wide variety of exceptional physical features. Dispersion properties of surface waves propagating at the interface between a nanocomposite made of a semiconductor inclusions systematically distributed in a transparent matrix and low-dimensional acoustic metamaterial, constructed by an array of nanowires implanted in a host material are investigated. We observed propagation of surface plasmon polaritons. It is demonstrated that one may dramatically modify properties of the system by tuning the geometry of inclusions
Temporal Photonic Crystal with a Square profile of both permittivity and Permeability
No full textWe study a temporal photonic crystal with square profile ofpermittivity and permeability. The continuity of the D(t)and B(t) fields across the time discontinuities facilitates theKronig-Penney methodology, leading to an analytic photonicband structure (PBS). It is periodic in frequency andexhibits k bands separated by k-gaps, but for equal modulationsthe PBS is composed of straight lines without k-gaps.The field D(t) displays the Bloch-Floquet behavior
Single-shot quantitative phase imaging facilitated by a bifunctional metasurface
No full textA bifunctional metasurface was fabricated to facilitate quantitative phase imaging. The silicon-based metasurface is made of elliptical nanopillars and acts as a polarization splitter allowing for the recording of two images, where one is shifted from the other. The two images were then used in an iterative calculation to retrieve the phase information of technical samples like lenses
2D Transition Metal Dichalcogenides for Tunable Optronics and Ultra-Thin Flat Optics
No full textIn this talk, I will introduce photonsieves and flat lenses made from MoS2 by exploring the strong excitonic absorption for high efficiency large angle of view hologram and sub-diffraction limit imaging,, the observation of strong oscillator strength in interlayer excitons in WS2/HfS2 heterostructure and its application in room temperature operation high sensitivity mid-IR photodetection, and the electrostatically tunable plasmonic responses in near IR range from solution processed atomically thin NbSe2
Laser printing of spherical silicon nanoparticles for in-plane color routing
No full textFemtosecond laser printing allows the creation of spherical nanoparticles on a wide range of substrates. Here we apply this technique to fabricate Mie-resonant color-routing nanoantennas. First, we place single silicon particles on a dielectric multilayer and demonstrate color-selective directional excitation of Bloch surface waves. Second, we create asymmetric dimers of silicon nanospheres that provide color-selective directional scattering of evanescent waves. Our results highlight the potential of laser printing as an advanced fabrication technique for integrated optics
Reflection and transmission coefficients at plane interfaces between transformation-optics media
No full textThe reflection and transmission phenomena occurring at the plane interface between two transformation-optics media are analyzed. In order to compute the reflection and transmission coefficients the wave vectors and the polarizations of the incident, reflected and transmitted waves are described inside the anisotropic and inhomogeneous media at the interface plane. The reflection and transmission coefficients are derived in terms of the coordinate transformations which are describing the transformation-optics media