Issue 24 (2024)

Spin-bearing molecules as optically addressable platforms for quantum technologies

Spin-bearing molecules as optically addressable platforms for quantum technologies

Efforts to harness quantum hardware relying on quantum mechanical principles have been steadily progressing. The search for novel material platforms that could spur the progress by providing new functionalities for solving the outstanding technological …

A comprehensive review of metasurface-assisted direction-of-arrival estimation

A comprehensive review of metasurface-assisted direction-of-arrival estimation

Direction of arrival (DoA) estimation is a key research focus in array signal processing, and numerous progressive direction-finding algorithms have already been developed. In terms of the development of algorithms, metasurfaces can help innovate traditional …

Coherence vortices by binary pinholes

Coherence vortices by binary pinholes

Singularity in a two-point complex coherence function, known as coherence vortices, represents zero visibility with a helical phase structure. In this paper, we introduce a novel technique to generate the coherence vortices of different topological charges by …

Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces

Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces

Non-Hermitian systems can be tuned to exhibit exceptional points, where both eigenvalues and eigenstates coalesce concurrently. The inherent adaptability of photonic non-Hermitian systems in configuring gain and loss has allowed us to observe a plethora of …

Wide FOV metalens for near-infrared capsule endoscopy: advancing compact medical imaging

Wide FOV metalens for near-infrared capsule endoscopy: advancing compact medical imaging

This study presents the design, fabrication, and characterization of a wide field-of-view (FOV) metalens optimized for capsule endoscopy. The metalens achieved a 165° FOV with a high modulation transfer function (MTF) of 300 lines per millimeter (lp/mm) …

Anisotropic nonlinear optical responses of Ta_2 NiS_5 flake towards ultrafast logic gates and secure all-optical information transmission

Anisotropic nonlinear optical responses of Ta_2 NiS_5 flake towards ultrafast logic gates and secure all-optical information transmission

Optical logic gates based on nonlinear optical property of material with ultrafast response speed and excellent computational processing power can break the performance bottleneck of electronic transistors. As one of the layered 2D materials, Ta_2 NiS_5 …

Transverse optical torque from the magnetic spin angular momentum

Transverse optical torque from the magnetic spin angular momentum

We report a transverse optical torque exerted on a conventional isotropic spherical particle in a direction perpendicular to that of the illuminating wave propagation. By using full-wave simulations and deriving an analytical expression of the transverse …

Sub-picosecond biphasic ultrafast all-optical switching in ultraviolet band

Sub-picosecond biphasic ultrafast all-optical switching in ultraviolet band

Ultrafast all-optical control has been a subject of wide-spread attention as a method of manipulating optical fields using light excitation on extremely short time scales. As a fundamental form of ultrafast all-optical control, all-optical switching has …

Thermally tunable add-drop filter based on valley photonic crystals for optical communications

Thermally tunable add-drop filter based on valley photonic crystals for optical communications

Valley photonic crystals (VPCs) provide an intriguing approach to suppress backscattering losses and enable robust transport of light against sharp bends, which could be utilized to realize low-loss and small-footprint devices for on-chip optical …

Full-space trifunctional metasurface with independent control of amplitude and phase for circularly polarized waves

Full-space trifunctional metasurface with independent control of amplitude and phase for circularly polarized waves

Flexible and diverse manipulation of electromagnetic (EM) waves in half space (reflection or transmission) has facilitated strong aspiration toward full-space wave control. However, it remains challenging to achieve independent amplitude and phase control, …

Stretchable plasmonic metasurfaces for deformation monitoring

Stretchable plasmonic metasurfaces for deformation monitoring

Metasurfaces have recently gained significant attention due to the strong capacity in light field manipulation. However, most traditional metasurfaces are fabricated on rigid substrates, which fix their functionality after fabrication and limit their …

Large-scale high purity and brightness structural color generation in layered thin film structures via coupled cavity resonance

Large-scale high purity and brightness structural color generation in layered thin film structures via coupled cavity resonance

Structural colors, resulting from the interaction of light with nanostructured materials rather than pigments, present a promising avenue for diverse applications ranging from ink-free printing to optical anti-counterfeiting. Achieving structural colors with …

Leveraging multiplexed metasurfaces for multi-task learning with all-optical diffractive processors

Leveraging multiplexed metasurfaces for multi-task learning with all-optical diffractive processors

Diffractive Neural Networks (DNNs) leverage the power of light to enhance computational performance in machine learning, offering a pathway to high-speed, low-energy, and large-scale neural information processing. However, most existing DNN architectures are …