63 citations · 262 across the 14 of their papers we have counts for
10 papers · 1 filter
Directional coupling to a nano-waveguide
Alessandro Tuniz, Sabrina Garattoni, Han-Hao Cheng +1
Silicon-based micro-devices are considered promising candidates for consolidating several terahertz technologies into a common and practical platform. The practicality stems from t…
Broadband terahertz near-field excitation and detection of silicon photonic crystal modes
Kseniia Lezhennikova, Sahand Mahmoodian, Boris T. Kuhlmey +4
Chip-based terahertz (THz) devices are emerging as versatile tools for manipulating mm-wave frequencies in the context of integrated high-speed communication technologies for poten…
Subwavelength terahertz imaging via virtual superlensing in the radiating near field
Alessandro Tuniz, Boris T. Kuhlmey
Paradoxically, imaging with resolution much below the wavelength - now common place in the visible spectrum - remains challenging at lower frequencies, where arguably it is nee…
Flexible terahertz photonic light-cage modules for in-core sensing and high temperature applications
Alessio Stefani, Boris T. Kuhlmey, Justin Digweed +4
Terahertz (THz) technology is a growing and multi-disciplinary research field, particularly for sensing and telecommunications. A number of THz waveguides have emerged over the pas…
Influence of non-Hermitian mode topology on refractive index sensing with plasmonic waveguides
Alessandro Tuniz, Markus A. Schmidt, Boris T. Kuhlmey
We evaluate the sensing properties of plasmonic waveguide sensors by calculating their resonant transmission spectra in different regions of the non-Hermitian eigenmode space. We e…
In-fiber second-harmonic generation with embedded two-dimensional materials
Gia Quyet Ngo, Emad Najafidehaghani, Ziyang Gan +10
Silica-based optical fibers are a workhorse of nonlinear optics. They have been used to demonstrate nonlinear phenomena such as solitons and self-phase modulation. Since the introd…
Bend losses in flexible polyurethane antiresonant terahertz waveguides
Alessio Stefani, Jonathan Skelton, Alessandro Tuniz
The quest for practical waveguides operating in the terahertz range faces two major hurdles: large losses and high rigidity. While recent years have been marked by remarkable progr…
Omnidirectional field enhancements drive giant nonlinearities in epsilon-near-zero waveguides
Gordon H. Y. Li, C. Martijn de Sterke, Alessandro Tuniz
Bulk materials possessing a relative electric permittivity close to zero exhibit giant Kerr nonlinearities. However, harnessing this response in guided-wave geometrie…
Modular Hybrid Plasmonic Integrated Circuit -- Rotation, Nanofocusing and Nonlinear Enhancement
Alessandro Tuniz, Oliver Bickerton, Fernando J. Diaz +5
We introduce a modular approach for efficiently interfacing photonic integrated circuits with deep-sub-wavelength hybrid plasmonic functionality. We demonstrate that an off-the-she…
Tuning the Effective PT-Phase of Plasmonic Eigenmodes
Alessandro Tuniz, Torsten Wieduwilt, Markus A. Schmidt
We experimentally observe an effective PT-phase transition through the exceptional point in a hybrid plasmonic-dielectric waveguide system. Transmission experiments reveal fundamen…