We report a simple subwavelength-diameter plastic wire, similar to an optical fiber, for guiding terahertz wave with low attenuation constant. With large wavelength-to-fiber-core ratio, the fractional power delivered inside lossy core is reduced, thus lowering effective fiber In our experiment we adopt polyethylene 200 µm diameter waves in frequency range near 0.3 THz which constant reduced of order or less than 0.01 cm−1. Direct free-space coupling efficiency as high 20% can be achieved by...

We propose and demonstrate a simple leaky structure for terahertz (THz) waveguiding. Different from previously reported air-core THz waveguides, in which high-reflection-coated cladding layer is designed, the proposed here pipe with large air core thin dielectric uniform but low index. Using commercially available Teflon pipes, we experimentally confirm that waves can be successfully guided central of 3-m-long pipes excellent mode qualities, high coupling efficiencies, attenuation constants,...

We demonstrate a fundamentally mode-locked Yb-fiber laser with 3 GHz repetition rate and ∼206 fs pulse duration. The incorporates two enabling technologies: 1 cm heavily Yb-doped phosphate glass fiber as the gain medium high-dispersion (-1300 fs2) output coupler to manage cavity dispersion. oscillator self-starts generates up 53 mW average power.

With global aging, robots are considered a promising solution for handling the shortage of aged care and companionships. However, these technologies would serve little purpose if their intended users do not accept them. While socioemotional selectivity theory predicts that older adults offer emotionally meaningful relationships, selective optimization with compensation model compensate functional losses.The present study aims to understand adults' expectations compare acceptance ratings 2...

We demonstrate a room-temperature-operated all-terahertz (THz) fiber-scanning near-field imaging system. The upright-type THz microscope has compact size, capable of being integrated with an optical microscope. This transmission illumination system could be promising tool to distinguish breast cancer from the normal tissue without pathologic staining.

We both theoretically and experimentally investigate the optimization of femtosecond Yb-doped fiber amplifiers (YDFAs) to achieve high-quality, high-power, compressed pulses. Ultrashort pulses amplified inside YDFAs are modeled by generalized nonlinear Schrödinger equation coupled steady-state propagation-rate equations. use this model study dependence compressed-pulse quality on YDFA parameters, such as gain fiber's doping concentration length, input pulse pre-chirp, duration, power. The...

Abstract Incorporation of phase‐change materials (PCM) into nanophotonic structures is a straightforward method for making them tunable. The binary semiconducting chalcogenide antimony trisulfide (Sb 2 S 3 ) suitable PCM applications in the near‐infrared (NIR) owing to its high refractive index, low optical losses, and wide bandgap. Therefore, this study, Sb Tamm plasmon polaritons (TPPs) are fabricated with focus on their widespread use applications. For this, gold film deposited...

We demonstrate a compact ultrafast source centered at 850 nm with >200 bandwidth (full width half-maximum) based on 3 GHz Yb-fiber master-oscillator-power-amplifier system. The output pulses (with up to 13 W average power) from the laser system are coupled into short (<50 mm) pieces of photonic crystal fibers excite broadband fiber-optic Cherenkov radiation; resulting broad phase-matching due fiber length produces an upconverted spectrum spanning in wavelength range 750-950 power 94, 184,...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> To accurately detect minute amounts of substances without disturbing the surroundings target molecules has been a major goal in bioanalytical technology. Here by integrating an optoelectronic terahertz (THz) microsource into glass-substrated microchip within near-field distance, we demonstrate compact, label-free, noninvasive, and sensitive microbiosensing system with low-power consumption. The...

We demonstrate a terahertz (THz) directional coupler for future THz applications including power dividers, communications, and fiber-endoscopes. By using subwavelength polyethylene fibers, we successfully established single-mode fiber-based coupler. Unlike traditional couplers, the demonstrated fiber shows less dependency on overlapped length of two fibers delivered frequency in our interested minimal-attenuation wavelength regime. tuning geometry, also show feasibility to control coupling ratio.

Inspired by graphene and transition-metal dichalcogenides (TMDs), a considerable focus has been centered on investigating exploring two-dimensional (2D) layered materials that possess excellent electronic, optical, physical, chemical properties. Owing to their nontoxic nature, inherent stability, exceptional optical electrical sensitivity, 2D lead-free double perovskites have attracted research attention. In this work, we present the fabrication of Au–Au/Ag yolk–shell plasmonic...

We report on the micromachining of silicon microlens structures by use scanning-probe gray-scale anodic oxidation along with dry anisotropic etching. Convex, concave, and arbitrarily shaped microlenses diameters as small 2?m are demonstrated. also confirm high fidelity pattern transfer between probe-induced oxides etched structures. Besides flexibility, important features pixel size pitch (of order tens nanometers), an unlimited number levels, possibility creating designed exquisite...

We demonstrate a high-energy femtosecond laser system that incorporates two rapidly advancing technologies: chirally-coupled-core large-mode-area Yb-fiber to ensure fundamental-mode operation and high-dispersion mirrors enable loss-free pulse compression while preserving the diffraction-limited beam quality. Mode-locking is initiated by saturable absorber mirror further shortening achieved nonlinear polarization evolution. Centered at 1045 nm with 39-MHz repetition rate, emits 25-nJ,...

We demonstrate a 3 GHz repetition rate, femtosecond Raman soliton source with its wavelength tunable from 1.15 to 1.35 μm. investigate the dependence of formation on different photonic-crystal fibers (PCFs), input powers, and fiber lengths. To produce peaking at same wavelength, shorter PCFs demand higher average powers consequently generate stronger pulses. Using 30 cm PCF NL-3.2-945, resulting pulse μm has 0.9 W power. The integrated relative intensity noise generated 54-cm NL-3.2-945 is...

Laser frequency combs are normally based on mode-locked oscillators emitting ultrashort pulses of ~100-fs or shorter.In this paper, we present a self-referenced comb narrowband (5-nm bandwidth corresponding to 415-fs transform-limited pulses) Yb-fiber oscillator with repetition rate 280 MHz.We employ nonlinear Ybfiber amplifier both amplify the and broaden their optical spectrum.To optimize carrier envelope offset (f CEO ), pulse amplification by pre-chirping at input.An optimum negative...

Metal–oxide–semiconductor capacitors (MOSCs) and MOS field-effect transistors (MOSFETs) incorporating cerium dioxide (CeO2) dielectrics were fabricated investigated. In this work, the electrical interfacial properties characterized by capacitance–voltage (C–V) current–voltage (I–V) measurements. The density of interface trap per unit area (Nit), energy (Dit), distribution density, effective capture cross section (σs) studied in details. Experimental results showed that Nit, Dit, σs about...

We report the design, installation and testing of a broadband green astro-comb on HARPS-N spectrograph at TNG telescope. The consists over 7000 narrow lines (<10-6 nm width) spaced by 16 GHz (0.02 550 nm) with wavelengths stabilized to Global Positioning System (GPS) flat power from 500 620 nm. are used calibrate measure its line profile. short term sensitivity is measured be less than 2 cm/s long-term drift approximately 10 cm/s/day. astrocomb has been partially automated future work...

Complex farmland backgrounds and varying light intensities make the detection of guidance paths more difficult, even with computer vision technology. In this study, a robust line extraction approach for use in vision-guided farming robot navigation is proposed. The crops, drip irrigation belts, ridges are extracted through deep learning method to form multiple feature points, which then fitted into regression using least squares method. Furthermore, learning-driven methods used detect weeds...