Issue 5 (2018)

Terahertz wave interaction with metallic nanostructures

Terahertz wave interaction with metallic nanostructures

Understanding light interaction with metallic structures provides opportunities of manipulation of light, and is at the core of various research areas including terahertz (THz) optics from which diverse applications are now emerging. For instance, …

Metamaterial superconductors

Metamaterial superconductors

Searching for natural materials exhibiting larger electron-electron interactions constitutes a traditional approach to high-temperature superconductivity research. Very recently, we pointed out that the newly developed field of electromagnetic …

Picosecond optical pulse processing using a terahertz-bandwidth reconfigurable photonic integrated circuit

Picosecond optical pulse processing using a terahertz-bandwidth reconfigurable photonic integrated circuit

Chip-scale integrated optical signal processors promise to support a multitude of signal processing functions with bandwidths beyond the limit of microelectronics. Previous research has made great contributions in terms of demonstrating processing …

Enhanced broadband absorption in nanowire arrays with integrated Bragg reflectors

Enhanced broadband absorption in nanowire arrays with integrated Bragg reflectors

A near-unity unselective absorption spectrum is desirable for high-performance photovoltaics. Nanowire (NW) arrays are promising candidates for efficient solar cells due to nanophotonic absorption resonances in the solar spectrum. The absorption …

Six-port optical switch for cluster-mesh photonic network-on-chip

Six-port optical switch for cluster-mesh photonic network-on-chip

Photonic network-on-chip for high-performance multi-core processors has attracted substantial interest in recent years as it offers a systematic method to meet the demand of large bandwidth, low latency and low power dissipation. In this paper we …

Atto-Joule, high-speed, low-loss plasmonic modulator based on adiabatic coupled waveguides

Atto-Joule, high-speed, low-loss plasmonic modulator based on adiabatic coupled waveguides

In atomic multi-level systems, adiabatic elimination (AE) is a method used to minimize complicity of the system by eliminating irrelevant and strongly coupled levels by detuning them from one another. Such a three-level system, for instance, can be …

Integrated five-port non-blocking optical router based on mode-selective property

Integrated five-port non-blocking optical router based on mode-selective property

In this paper, we propose and demonstrate a five-port optical router based on mode-selective property. It utilizes different combinations of four spatial modes at input and output ports as labels to distinguish its 20 routing paths. It can direct …

Subwavelength grating slot (SWGS) waveguide at 2 ?m for chip-scale data transmission

Subwavelength grating slot (SWGS) waveguide at 2 ?m for chip-scale data transmission

We propose, design, fabricate and characterize a subwavelength grating slot (SWGS) waveguide on silicon platform at short-wave infrared (SWIR) wavelength of 2 ?m. The mode guiding mechanism, i.e. SWGS mode, is a combination of surface-enhanced …

Optical characterizations of two-dimensional materials using nonlinear optical microscopies of CARS, TPEF, and SHG

Optical characterizations of two-dimensional materials using nonlinear optical microscopies of CARS, TPEF, and SHG

In this paper, we employ the nonlinear optical microscopies of coherent anti-Stokes Raman scattering spectroscopy, two-photon excitation fluorescence, and second harmonic generation to characterize the properties of two-dimensional (2D) materials. …

Anomalous temperature coefficient of resistance in graphene nanowalls/polymer films and applications in infrared photodetectors

Anomalous temperature coefficient of resistance in graphene nanowalls/polymer films and applications in infrared photodetectors

Graphene nanowalls (GNWs) exhibit outstanding optoelectronic properties due to their peculiar structure, which makes them a great potential in infrared (IR) detection. Herein, a novel IR detector that is composed of polydimethylsiloxane (PDMS) and …

Multi-color imaging of sub-mitochondrial structures in living cells using structured illumination microscopy

Multi-color imaging of sub-mitochondrial structures in living cells using structured illumination microscopy

The dimensions of mitochondria are close to the diffraction limit of conventional light microscopy techniques, making the complex internal structures of mitochondria unresolvable. In recent years, new fluorescence-based optical imaging techniques …

Dispersion features of complex waves in a graphene-coated semiconductor nanowire

Dispersion features of complex waves in a graphene-coated semiconductor nanowire

The dispersion features of a graphene-coated semiconductor nanowire operating in the terahertz frequency band are consistently studied in the framework of a special theory of complex waves. Detailed classification of the waveguide modes was carried …

Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

We introduce a novel magnetoplasmonic sensor concept for sensitive detection of refractive index changes. The sensor consists of a periodic array of Ni/SiO2/Au dimer nanodisks. Combined effects of near-field interactions between the Ni and Au disks …

Comprehensive studies of the Ag+ effect on borosilicate glass ceramics containing Ag nanoparticles and Er-doped hexagonal NaYF4 nanocrystals: morphology, structure, and 2.7 ?m emission

Comprehensive studies of the Ag+ effect on borosilicate glass ceramics containing Ag nanoparticles and Er-doped hexagonal NaYF4 nanocrystals: morphology, structure, and 2.7 ?m emission

In this work, we have performed a comprehensive investigation of the Ag+ concentration effect on the morphological, thermal, structural, and mid-infrared emission properties of novel oxyfluoride borosilicate glasses and glass ceramics containing …

Manipulating line waves in flat graphene for agile terahertz applications

Manipulating line waves in flat graphene for agile terahertz applications

Reducing open waveguides enabled by surface waves, such as surface plasmon polaritons, to a one-dimensional line is attractive due to the potentially enhanced control over light confinement and transport. This was recently shown to be possible by …