Muhammad Fayyaz Kashif

Istituto Italiano di Tecnologia | IIT · Centre for Biomolecular Nanotechnologies

We present a strategy to enhance the performances of optical neural implants using the interaction of light guided in multimode fibers with angle- and wavelength-dependent resonances supported by integrated plasmonic metasurfaces.

Plasmonics In article number 2200975, Liam Collard, Massimo De Vittorio, Ferruccio Pisanello, and co‐workers use wavefront engineering to harness the resonant properties of plasmonic nanostructures on the tip of a multimode fiber and spotlight specific resonances across the dispersion diagram to enable spatially‐resolved surface enhanced Raman spec...

Integration of plasmonic structures on step‐index optical fibers is attracting interest for both applications and fundamental studies. However, the possibility to dynamically control the coupling between the guided light fields and the plasmonic resonances is hindered by the turbidity of light propagation in multimode fibers (MMFs). This pivotal po...

Phase change materials are suitable for tunable photonic devices where the optical response can be altered under external stimuli, such as heat, an electrical or an optical signal. In this scenario, we performed numerical simulations to study the optical properties of a flat unpatterned resonant structure and a grating, both coated with a thin film...

In article number 2101649, Filippo Pisano and co-workers demonstrate a first step towards implantable multimodal plasmonic neural interfaces. This was achieved by integrating highly-curved plasmonic nanostructures on a tapered optical fiber in order to engineer the spectral and angular patterns of optical emission and collection, with applications...

Optical methods are driving a revolution in neuroscience. Ignited by optogenetic techniques, a set of strategies has emerged to control and monitor neural activity in deep brain regions using implantable photonic probes. A yet unexplored technological leap is exploiting nanoscale light-matter interactions for enhanced bio-sensing, beam-manipulation...

Fabricating plasmonic nanostructures with good optical performances often requires lengthy and challenging patterning processes that can hardly be transferred to unconventional substrates, such as optical fiber tips or curved surfaces. Here we investigate the use of a single Ga focused ion beam process to fabricate 2D arrays of gold nanoplatelets f...

We theoretically and experimentally investigate the optical properties arising from the illumination of a subset of elements in FIB-milled 2D-periodic arrays of gold nanoplatelets with sub-20-nm gaps.

Plasmonic platforms are a promising solution for the next generation of low-cost, integrated biomedical sensors. However, fabricating these nanostructures often requires lengthy and challenging fabrication processes. Here we exploit the peculiar features of Focused Ion Beam milling to obtain single-step patterning of a plasmonic two-dimensional (2D...

In this study, we present a two-dimensional dielectric grating which allows achieving high absorption in a monolayer graphene at visible and near-infrared frequencies. Dielectric gratings create guided-mode resonances that are exploited to effectively couple light with the graphene layer. The proposed structure was numerically analyzed through a ri...

Photovoltaic (PV) panels are subject to partial shading in many practical situations due to nearby obstacles like trees, buildings and the adjacent PV panels. Multiple peaks can exist on the resulting power-voltage (P-V) characteristics of the PV panel under partial shading conditions. This may disturb the efficient maximum power point tracking (MP...