Issue 4 (2020)

Linear and third-order nonlinear optical properties of self-assembled plasmonic gold metasurfaces

Linear and third-order nonlinear optical properties of self-assembled plasmonic gold metasurfaces

The emergence of metamaterials (MMs) has led to groundbreaking photo-physical phenomena, which arise from their novel structure-dependent properties. Consisting of “meta-atom” building blocks, MMs can be organized into subwavelength …

Structures for surface-enhanced nonplasmonic or hybrid spectroscopy

Structures for surface-enhanced nonplasmonic or hybrid spectroscopy

Absorption, scattering, and fluorescence are processes that increase with electric field intensity. The most prominent way to enhance electric field intensity is to use localized or propagating surface plasmon polaritons (SPPs) based on metallic …

Recent investigations on nonlinear absorption properties of carbon nanotubes

Recent investigations on nonlinear absorption properties of carbon nanotubes

Carbon nanotubes (CNTs) are carbon based nanomaterials with long hollow structure and diameter at the nanometer scale. The chirality in combination with the radius determines the unique properties of CNTs. These CNTs with different properties have …

Localization STED (LocSTED) microscopy with 15 nm resolution

Localization STED (LocSTED) microscopy with 15 nm resolution

We present localization with stimulated emission depletion (LocSTED) microscopy, a combination of STED and single-molecule localization microscopy (SMLM). We use the simplest form of a STED microscope that is cost effective and synchronization free, …

Scanning the plasmonic properties of a nanohole array with a single nanocrystal near-field probe

Scanning the plasmonic properties of a nanohole array with a single nanocrystal near-field probe

The electromagnetic properties of ordered hole nanostructures in very thin metal films are characterized using CdSe/CdS nanocrystals (NCs) as nanoprobes. The characterization of the local density of optical states (LDOS) on the nanostructure is …

Magnetic and electric Mie-exciton polaritons in silicon nanodisks

Magnetic and electric Mie-exciton polaritons in silicon nanodisks

Light-matter interactions at the nanoscale constitute a fundamental ingredient for engineering applications in nanophotonics and quantum optics. In this regard, Mie resonances supported by high-refractive index dielectric nanoparticles have recently …

Enhanced sum frequency generation for ultrasensitive characterization of plasmonic modes

Enhanced sum frequency generation for ultrasensitive characterization of plasmonic modes

Highly sensitive characterization of surface plasmon resonance (SPR) modes lays the solid foundation for wide SPR-related applications. Herein, we discover that these SPR modes based on all-metal nanostructures without any probed molecule can be …

CMOS-compatible a-Si metalenses on a 12-inch glass wafer for fingerprint imaging

CMOS-compatible a-Si metalenses on a 12-inch glass wafer for fingerprint imaging

Metalenses made of artificial sub-wavelength nanostructures have shown the capability of light focusing and imaging with a miniaturized size. Here, we report the demonstration of mass-producible amorphous silicon metalenses on a 12-inch glass wafer …

Ultralow power demand in fluorescence nanoscopy with digitally enhanced stimulated emission depletion

Ultralow power demand in fluorescence nanoscopy with digitally enhanced stimulated emission depletion

Stimulated emission depletion (STED) microscopy breaks the optical diffraction barrier and has become a powerful tool for biological study. However, its application for in vivo study is limited because of its high demand for depletion power. Here, …

Diffraction-limited axial double foci and optical traps generated by optimization-free planar lens

Diffraction-limited axial double foci and optical traps generated by optimization-free planar lens

Axial diffraction-limited multiple foci are a kind of investigated focal field for trapping multiple nano-particles. We first experimentally generated diffraction-limited axial double foci by optimization-free binary planar lens and theoretically …

Dynamic thermal camouflage via a liquid-crystal-based radiative metasurface

Dynamic thermal camouflage via a liquid-crystal-based radiative metasurface

Thermal camouflage, which is used to conceal objects in the infrared vision for confrontation with infrared detection in civilian or military applications, has garnered increasing attraction and interest recently. Compared with conductive thermal …

Topological nanospaser

Topological nanospaser

We propose a nanospaser made of an achiral plasmonic–metal nanodisk and a two-dimensional chiral gain medium – a monolayer nanoflake of a transition-metal dichalcogenide (TMDC). When one valley of the TMDC is selectively pumped (e.g. by a …

Polarization-encrypted high-resolution full-color images exploiting hydrogenated amorphous silicon nanogratings

Polarization-encrypted high-resolution full-color images exploiting hydrogenated amorphous silicon nanogratings

As a prominent alternative to toxic dyes/pigments, nanostructural color pixels have garnered tremendous attention in applications related to display/imaging devices and color printings. However, current color pixels mostly offer static color …

Active analog tuning of the phase of light in the visible regime by bismuth-based metamaterials

Active analog tuning of the phase of light in the visible regime by bismuth-based metamaterials

The active and analog tuning of the phase of light by metamaterials is needed to boost the switching performance of photonic devices. However, demonstrations of this type of tuning in the pivotal visible spectral region are still scarce. Herein, we …

Observing and controlling a Tamm plasmon at the interface with a metasurface

Observing and controlling a Tamm plasmon at the interface with a metasurface

We demonstrate experimentally that Tamm plasmons in the near infrared can be supported by a dielectric mirror interfaced with a metasurface, a discontinuous thin metal film periodically patterned on the sub-wavelength scale. More crucially, not only …

Switchable active phase modulation and holography encryption based on hybrid metasurfaces

Switchable active phase modulation and holography encryption based on hybrid metasurfaces

Metasurfaces are planar devices containing delicately designed nanoantenna or resonator arrays that allow for beam shaping, super resolution imaging, and holography. Hybrid metasurface – by integrating with tunable materials such as …

Monolithic high-contrast grating planar microcavities

Monolithic high-contrast grating planar microcavities

Semiconductor planar microcavities significantly enhance the interaction between light and matter and are thus crucial as a fundamental research platform for investigations of quantum information processing, quantum dynamics, and exciton-polariton …

Opto-thermoelectric speckle tweezers

Opto-thermoelectric speckle tweezers

Opto-thermoelectric tweezers present a new paradigm for optical trapping and manipulation of particles using low-power and simple optics. New real-life applications of opto-thermoelectric tweezers in areas such as biophysics, microfluidics, and …

Perovskite random lasers on fiber facet

Perovskite random lasers on fiber facet

Hybrid lead halide perovskites have made great strides in next-generation photovoltaic and optoelectronic devices. Random lasers based on perovskite materials have been intensively investigated, but the miniaturization of perovskite random lasers …

Large area metasurfaces made with spherical silicon resonators

Large area metasurfaces made with spherical silicon resonators

High-index dielectric nanostructures have emerged as an appealing complement to plasmonic nanostructures, offering similar light management capabilities at the nanoscale but free from the inherent optical losses. Despite the great interest in these …

Ultrabright single-photon emission from germanium-vacancy zero-phonon lines: deterministic emitter-waveguide interfacing at plasmonic hot spots

Ultrabright single-photon emission from germanium-vacancy zero-phonon lines: deterministic emitter-waveguide interfacing at plasmonic hot spots

Striving for nanometer-sized solid-state single-photon sources, we investigate atom-like quantum emitters based on single germanium-vacancy (GeV) centers isolated in crystalline nanodiamonds (NDs). Cryogenic characterization indicated …

Breaking polarisation-bandwidth trade-off in dielectric metasurface for unpolarised white light

Breaking polarisation-bandwidth trade-off in dielectric metasurface for unpolarised white light

Optical metasurfaces have gained attention due to their considerable prospects, which can benefit consumers and industries in terms of virtual reality devices and digital displays in various multimedia and entertainment-related applications. To …

A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

Using an all-fiber mode selective coupler (MSC) at the visible band, here we experimentally demonstrate a generating and wavelength multiplexing scheme for the cylindrical vector (CV) and vortex beams (VBs). The proposed MSCs act as efficient mode …