| 91 | Shafir, Mirit Hen, Moshe Katzman, Etai Grunwald, Dvir Munk, Moshe Feldberg, Tali Sharabani, Naor Inbar, Gil Bashan, Avi Zadok. “Thermo-Elastic GigahertzFrequency Oscillator through Surface Acoustic Wave-Silicon Photonics.” Optics Express, 2023. • Alon Bernstein, Elad Zehavi, Yosef London, Mirit Hen, Andrei Stolov, Avi Zadok. “Measuring Glass Transition of a Polymer Coating Layer Over Working Fiber using Forward Brillouin Scattering.” Lightwave Technol , 2023. Prof. Zalevsky Zeev Dean of Faculty of Engineering Electro-Optic Laboratory Research Areas • Super-resolution • Nano-photonics • In-fiber devices • Fiber optics • Optical data processing • Diffractive optical elements and beam shaping • 3D estimation • RF photonics 1. Nano Photonics and Plasmonics Abstract The ability to control the energy flow of light at the nanoscale is fundamental to modern communication, big-data technologies, and quantum information processing schemes. However, since photons are diffraction-limited, efforts to confine them to dimensions of integrated electronics have so far proven elusive. A promising way to facilitate nanoscale manipulation of light is through plasmon polaritons—coupled excitations of photons and charge carriers. These tightly confined hybrid waves can facilitate compression of optical functionalities to the nanoscale but suffer from huge propagation losses that limit their use to mostly subwavelength scale applications. With only weak evidence of macroscale plasmon polaritons, propagation has recently been reported theoretically and indirectly. No experiments so far have directly resolved long-range propagating optical plasmons in real space. Here, we launch and detect nanoscale optical signals to record distances in a wireless link based on novel plasmonic nanotransceivers. We use a combination of scanning probe microscopies to provide high-resolution real-space images of the optical near fields and investigate their long-range propagation principles. We design our nanotransceivers based on a high-performance nanoantenna, Plantenna, hybridized with channel plasmon waveguides with a cross-section of 20 nm × 20 nm. We observe propagation for distances up to 1000 times greater than the plasmon wavelength. We experimentally show that our approach hugely outperforms both waveguide and wireless nanophotonic links. This successful alliance between Plantenna and plasmon waveguides paves the way for new generations of optical interconnects and expedites long-range interaction between quantum emitters and photomolecular devices. 2. All-Optical Silicon-Photonic Constellation Abstract Optical communication networks use electrical constellation converters requiring optical-electrical-optical conversions and expensive symbol-rate limiting electronics. This paper proposes a generic method for all-optical silicon-photonic conversion of amplitude-phase modulation formats. The method is based on implementing singlelayer radial basis function neural networks. 3. Remote Sensing of Nano Vibrations Abstract We have developed a technological platform that can be used for remote sensing of nano-vibrations, biomedical parameter estimation, and establishing a directional communication channel. The technology is based upon illuminating a surface with a laser and then using an imaging camera to perform temporal and spatial tracking of secondary speckle patterns to have a nanometric accurate estimation of the movement of the backreflecting surface. Biomedical monitoring can be realized if the back-reflecting surface is a skin close to main blood arteries. If the surface is close to our neck or head, then a directional communication channel can be established for remote, directional, and noise-isolated sensing of speech signals. The proposed technology was already applied for remote and continuous estimation of heartbeats, respiration, blood pulse pressure, intraocular pressure (IOP), communication with ALS patients, estimation of alcohol and glucose concentrations in the bloodstream, blood coagulation, and oximetry. 4. Label-Free Super-Resolution Abstract We present new super-resolution imaging methods for exceeding the diffraction limit, which is the fundamental limitation on the spatial resolution of any imaging system. This limitation stems from the physical nature of the optical waves. Superresolution techniques involve resolution enhancement of an image beyond this limitation. Superresolution methods are based on the understanding that highresolution spatial distribution can be obtained if a priori information on the object exists. By utilizing this information, one may properly sacrifice it to achieve gain in the spatial domain. Our research presents super-resolution methods that use either the time domain or the field of view domain. In time multiplexing super-resolution, the object is assumed to be stationary during imaging. Thus, capturing a sequence of images and extracting the super-resolution image from them is possible. In field-of-view
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