This study explores the polarization-dependent behavior of anapole states in stacked elliptical amorphous silicon nanodisks separated by silicon-di-oxide spacer layers. By rotating the incident electric field's polarization angle, the anapole state can be selectively excited at two distinct wavelength positions separated by 80 nm. This dual-wavelength anapole excitation capability holds promise for tunable sensors, frequency converters, and quantum memory applications. This work presents the polarization-dependent behavior of the anapole state in stacked amorphous silicon (a-Si) nanodisks wi ..read more

This article presents rigorous optical dispersion analyses from the ultraviolet to the shortwave infrared of large-area CH3NH3PbBr3 single crystals with high-quality surface finishes. The analyses yield robust optical constants for all wavelength regimes by appending variable-angle spectroscopic ellipsometry with corresponding transmission measurements. Derived optical constants permit modeling of perovskite solar cells with optimized solar radiation absorption. Proper derivation of CH3NH3PbX3 (MAPbX3; where X = Cl−, Br−, I−) optical constants is a critical step toward the development of hig ..read more

The fabrication and characterization of all polymers-based bulk heterojunction type organic photodiode having a narrowband response in the near-infrared spectral region with full width at half-maxima of 63 nm is reported. The device exhibits a linear dynamic range of 35 dB, response speed of 893 kHz, and detectivity of 109 Jones at 808 nm excitation wavelength. The fabrication and characterization of an all polymers-based bulk heterojunction type organic photodiode having a narrowband response in the near-infrared spectral region with full width at half-maxima of 63 nm is reported. The activ ..read more

For the first time, a high power free-space/fiber Mamyshev ring oscillator, developed with commercially available elements and with a simple yet effective architecture, is reliably started by an external passively Q-switched microchip laser at 1064 nm. At 5 W incident pump power, the output pulses achieve ≈115 nJ, ≈70 nm spectral bandwidth and 50 fs compressed duration at a repetition rate of 12 MHz. Ultrafast fiber lasers (UFLs) have become an attractive alternative to solid-state lasers (SSL) due to their excellent beam quality, compactness, environmental stability, and easy thermal m ..read more

An overview of recent developments in the rapidly advancing research field of quantum metasurfaces is presented. These studies primarily focus on the utilization of metasurfaces in quantum light sources, manipulation of quantum states, and some quantum functionalities, demonstrating the potential of metasurfaces in developing miniaturized photonic quantum devices. Finally, the future prospects of this emerging research field are discussed. In recent decades, quantum information technologies have attracted significant attention and experienced rapid development due to their ultrafast processi ..read more

Silicon PNNs have demonstrated analog processing with unprecedented bandwidths, dynamic range, and scalability. Herein, the authors demonstrate broadband linear operation, high-speed analysis, and optimization. The radio-frequency analysis highlights the linear front-end, nonlinear back-end, the effects of linear and nonlinear silicon waveguide loss, and the impact of low-noise preamplification. Broadband analog signal processors utilizing silicon photonics have demonstrated a significant impact in numerous application spaces, offering unprecedented bandwidths, dynamic range, and tunability ..read more

Fully organic, radioluminescent nanoparticles with near-infrared (NIR) emission are synthesized using emulsion polymerization and “click” chemistry for less-toxic X-Ray bioimaging applications. X-Ray-induced NIR emission is achieved via four sequential energy transfers, where the nanoparticles exhibit a detectable NIR signal through porcine tissue in proof-of-concept imaging studies. Further, the nanoparticles show no cytotoxicity in human embryonic kidney cells. In the efforts to generate a less toxic X-Ray bioimaging contrast agent, a fully organic, radioluminescent nanoparticle system tha ..read more

A nanophotonic passively Q-switched integrated laser relying on two-dimensional materials is proposed and thoroughly studied. The optically pumped gain is provided by a transition metal dichalcogenide hetero-bilayer (MoS2/WSe2$\left(\text{MoS}\right)_{2} / \left(\text{WSe}\right)_{2}$) and the saturable absorption by a graphene monolayer. Following a meticulous design process, mW peak power, ps pulse duration, and GHz repetition rates are achieved, while requiring sub-mW pump power. A nanophotonic passively Q-switched lasing element in the near infrared is proposed and theoretically inv ..read more

The emission from an upconverting particle is used to illuminate a sample with a suspension of sub-diffractive particles and absorptive dye molecules to study perform either dynamic light scattering (DLS) or absorption correlation spectroscopy (ACS) with a sample volume which is 200 nm in the axial dimension. This axial depth of the sample volume is smaller than the diffraction limited depth. Conventionally, a collimated visible laser beam can only be focused to a transverse region volume with a waist of about 200 nm and an axial waist of about 1200 nm due to the wave nature of light. Severa ..read more

In article number 2300192, Christian Frydendahl, Uriel Levy, and co-workers demonstrate a new approach where plasmonic nanostructures are pierced through the hexagonal boron nitride layers to make atomic edge contacts to the graphene, thus maintaining the advantages of encapsulation, while enabling strong enhancement of the optical response of graphene from charge transfer from plasmonic decay in the nanocavities ..read more