63 citations · 262 across the 14 of their papers we have counts for
14 papers
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…
Optimisation and artifacts of photothermal excitation of microresonators
Liping Kevin Ge, Alessandro Tuniz, Martijn de Sterke +4
The excitation of microresonators using focused intensity modulated light, known as photothermal excitation, is gaining significant attention due to its capacity to accurately exci…
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…
Direct Growth of Monolayer MoS on Nanostructured Silicon Waveguides
Athira Kuppadakkath, Emad Najafidehaghani, Ziyang Gan +20
We report for the first time the direct growth of Molybdenum disulfide (MoS) monolayers on nanostructured silicon-on-insulator waveguides. Our results indicate the possibility…
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…
Self-stabilization of light sails by damped internal degrees of freedom
M. Z. Rafat, Holger R. Dullin, Boris T. Kuhlmey +7
We consider the motion of a light sail that is accelerated by a powerful laser beam. We derive the equations of motion for two proof-of-concept sail designs with damped internal de…
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…
Scalable functionalization of optical fibers using atomically thin semiconductors
Gia Quyet Ngo, Antony George, Robin Tristan Klaus Schock +14
Atomically thin transition metal dichalcogenides are highly promising for integrated optoelectronic and photonic systems due to their exciton-driven linear and nonlinear interactio…
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…