Issue 4 (2018)

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 …

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

A distributed feedback dual-gate graphene-channel field-effect transistor (DFB-DG-GFET) was fabricated as a current-injection terahertz (THz) light-emitting laser transistor. We observed a broadband emission in a 1–7.6-THz range with a maximum …

Experimental realization of a CMOS-compatible optical directed priority encoder using cascaded micro-ring resonators

Experimental realization of a CMOS-compatible optical directed priority encoder using cascaded micro-ring resonators

In this paper, we propose and experimentally demonstrate an integrated optical device that can implement the logical function of priority encoding from a 4-bit electrical signal to a 2-bit optical signal. For the proof of concept, the thermo-optic …

Optical activity in chiral stacks of 2D semiconductors

Optical activity in chiral stacks of 2D semiconductors

We show that the stacks of two-dimensional semiconductor crystals with the chiral packing exhibit optical activity and circular dichroism. We develop a microscopic theory of these phenomena in the spectral range of exciton transitions that takes …

Hollow spheres: crucial building blocks for novel nanostructures and nanophotonics

Hollow spheres: crucial building blocks for novel nanostructures and nanophotonics

In this review, we summarize the latest developments in research specifically derived from the unique properties of hollow microspheres, in particular, hollow silica spheres with uniform shells. We focus on applications in nanosphere (colloidal) …