The future and promise of flat optics: a personal perspective

The future and promise of flat optics: a personal perspective

Metasurfaces enable the redesign of optical components into thin, planar and multifunctional elements, promising a major reduction in footprint and system complexity as well as the introduction of new optical functions. The planarity of flat optics …

Ultra-broadband photodetectors based on epitaxial graphene quantum dots

Ultra-broadband photodetectors based on epitaxial graphene quantum dots

Graphene is an ideal material for hot-electron bolometers due to its low heat capacity and weak electron-phonon coupling. Nanostructuring graphene with quantum-dot constrictions yields detectors of electromagnetic radiation with extraordinarily high …

Fourier-transform spatial modulation spectroscopy of single gold nanorods

Fourier-transform spatial modulation spectroscopy of single gold nanorods

Sensing the scattered fields of single metallic nanostructures is a crucial step towards the applications of isolated plasmonic antennas, such as for the sensing of single molecules or nanoparticles. In the past, both near- and far-field …

Three-dimensional femtosecond laser processing for lab-on-a-chip applications

Three-dimensional femtosecond laser processing for lab-on-a-chip applications

The extremely high peak intensity associated with ultrashort pulse width of femtosecond laser allows us to induce nonlinear interaction such as multiphoton absorption and tunneling ionization with materials that are transparent to the laser …

Strong plasmonic enhancement of single molecule photostability in silver dimer optical antennas

Strong plasmonic enhancement of single molecule photostability in silver dimer optical antennas

Photobleaching is an effect terminating the photon output of fluorophores, limiting the duration of fluorescence-based experiments. Plasmonic nanoparticles (NPs) can increase the overall fluorophore photostability through an enhancement of the …

Plasmonics of magnetic and topological graphene-based nanostructures

Plasmonics of magnetic and topological graphene-based nanostructures

Graphene is a unique material in the study of the fundamental limits of plasmonics. Apart from the ultimate single-layer thickness, its carrier concentration can be tuned by chemical doping or applying an electric field. In this manner, the …

Thermally controlled femtosecond pulse shaping using metasurface based optical filters

Thermally controlled femtosecond pulse shaping using metasurface based optical filters

Shaping of the temporal distribution of the ultrashort pulses, compensation of pulse deformations due to phase shift in transmission and amplification are of interest in various optical applications. To address these problems, in this study, we have …

Design of graphene-based polarization-insensitive optical modulator

Design of graphene-based polarization-insensitive optical modulator

By exploiting the electroabsorption effect of graphene, we present a graphene-based polarization-insensitive optical modulator. The waveguide structure consists of a silica substrate, high-index silicon strip waveguide, Si3N4 dielectric spacer, two …

New ways of looking at very small holes – using optical nanoscopy to visualize liver sinusoidal endothelial cell fenestrations

New ways of looking at very small holes – using optical nanoscopy to visualize liver sinusoidal endothelial cell fenestrations

Super-resolution fluorescence microscopy, also known as nanoscopy, has provided us with a glimpse of future impacts on cell biology. Far-field optical nanoscopy allows, for the first time, the study of sub-cellular nanoscale biological structures in …

Plasmonic flat surface Fabry-Perot interferometry

Plasmonic flat surface Fabry-Perot interferometry

We report measurements of the optical transmission through a plasmonic flat surface interferometer. The transmission spectrum shows Fabry-Perot-like modes, where for each mode order, the maximal transmission occurs at a gap that grows linearly with …

Experimental realization of an optical digital comparator using silicon microring resonators

Experimental realization of an optical digital comparator using silicon microring resonators

We propose and experimentally demonstrate a silicon photonic circuit that can perform the comparison operation of two-bit digital signals based on microring resonators (MRRs). Two binary electrical signals regarded as two operands of desired …

Anomalous Bessel vortex beam: modulating orbital angular momentum with propagation

Anomalous Bessel vortex beam: modulating orbital angular momentum with propagation

Zero-order and higher-order Bessel beams are well-known nondiffracting beams. Namely, they propagate with invariant profile (intensity) and carry a fixed orbital angular momentum. Here, we propose and experimentally study an anomalous Bessel vortex …

Novel and versatile solid-state chemiluminescence sensor based on TiO2-Ru(bpy)32+ nanoparticles for pharmaceutical drugs detection

Novel and versatile solid-state chemiluminescence sensor based on TiO2-Ru(bpy)32+ nanoparticles for pharmaceutical drugs detection

This work describes a novel and versatile solid-state chemiluminescence sensor for analyte detection using TiO2-Ru(bpy)32+-Ce(IV). Herein, we report the synthesis, characterization, optimization and application of a new type of hybrid nanoparticles …

Surface-enhanced FAST CARS: en route to quantum nano-biophotonics

Surface-enhanced FAST CARS: en route to quantum nano-biophotonics

Quantum nano-biophotonics as the science of nanoscale light-matter interactions in biological systems requires developing new spectroscopic tools for addressing the challenges of detecting and disentangling weak congested optical signals. Nanoscale …

A review of laser electrode processing for development and manufacturing of lithium-ion batteries

A review of laser electrode processing for development and manufacturing of lithium-ion batteries

Laser processes for cutting, annealing, structuring, and printing of battery materials have a great potential in order to minimize the fabrication costs and to increase the electrochemical performance and operational lifetime of lithium-ion cells. …