<h2>Abstract</h2> We present in-line coating thickness measurements acquired simultaneously using 2 independent sensing modalities: terahertz pulsed imaging (TPI) and optical coherence tomography (OCT). Both techniques are sufficiently fast to resolve the of individual pharmaceutical tablets <i>in situ</i> during film operation, both direct structural that do not require multivariate calibration. The TPI sensor is suitable measure coatings greater than 50 μm can penetrate through thick even...

Spectral domain optical coherence tomography (OCT) has recently attracted a lot of interest in the pharmaceutical industry as fast and non-destructive modality for quantification thin film coatings that cannot easily be resolved with other techniques. Because relative infancy this technique, much research to date focused on developing in-line measurement technique assessing coating thickness. To better assess OCT quantification, paper evaluates tablets range thickness measured using...

We report the first, to best of our knowledge, experimental implementation a spinning-disk configuration for high-speed compressive image acquisition. A single rotating mask (i.e., spinning disk) with random binary patterns was utilized spatially modulate collimated terahertz (THz) or IR beam. After propagating through sample, THz beam measured using detector, and images were subsequently reconstructed sensing. demonstrate that 32-by-32 pixel could be obtained from 160 240 measurements in...

We report the development of a Spectral Domain Line Field Optical Coherence Tomography (LF-OCT) system, using broad bandwidth and spatial coherent Super-Continuum (SC) source.With conventional quasi-Continuous Wave (CW) setup we achieve axial resolutions up to 2.1 μm in air 3D volume imaging speeds 213 kA-Scan/s.Furthermore, use single SC pulse, 2 ns duration, temporally gate an OCT B-Scan image 70 A-Scans.This is equivalent 35 GA-Scans/s.We apply CW for high resolution fine structures human...

Optical coherence tomography (OCT) is a nonintrusive optical imaging method offering micrometer-scale spatial resolution, enabling the generation of internal structural cross-sectional images. Since first OCT was invented in early 1990s, its utilization has become prevalent field ophthalmology and one golden standards clinical diagnosis. Beyond extensive research biomedical fields, because accomplished exceptional resolution rapid acquisition rate, also been explored as an emerging solution...

Optical excitation is widely acknowledged as one of the most effective means balancing sensor responses and response/recovery properties at room temperature (RT, 25 °C). Moreover, noble metals have been proven to be suitable photosensitizers for optical excitation. Localized surface plasmon resonance (LSPR) determines liberalization quasi-free electrons in under light irradiation, numerous injected semiconductors will greatly promote generation chemisorbed oxygen, thus elevating response. In...

We have demonstrated for the first time, to our knowledge, use of optical coherence tomography (OCT) as an analytical tool nondestructively characterizing individual paint layer thickness multiple layered automotive paints. A graph-based segmentation method was used automatic analysis distribution top layers solid color The thicknesses measured with OCT were in good agreement microscope and ultrasonic techniques that are current standard automobile industry. Because its high axial resolution...

Optical coherence tomography (OCT) has recently been demonstrated to measure the film coating thickness of pharmaceutical tablets and pellets directly. The results enable analysis inter- intra-tablet variability at an off-line in-line setting. To date, only a few formulations have tried there is very little information on applicability OCT other coatings. As it well documented that optical methods including are prone scattering leading limited penetration, some coatings may not be measurable...

Optical coherence tomography (OCT) can monitor human donor corneas non-invasively during the de-swelling process following storage for corneal transplantation, but currently only resultant thickness as a function of time is extracted. To visualize and quantify mechanism de-swelling, we present method exploiting nanometer sensitivity Fourier phase in OCT data to image deformation velocities. The technique was demonstrated by showing that osmotic flow through an intact epithelium negligible...

As an unconventional gas reservoir, bauxite reservoirs have often been studied as weathered crust cover layers rather than in the past. The Taiyuan Formation Longdong area of Ordos Basin has achieved breakthroughs, and some wells obtained industrial airflow. Therefore, it is necessary to conduct basic geological research on reservoir. application casting thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD), high-pressure mercury injection (HPMI), low-temperature...

The interaction between the ionospheres of non-magnetized planets or moons and stellar winds planetary plasma flows results in formation an induced magnetosphere, which is generally influenced by external magnetic fields. Observing response magnetosphere to fields crucial for understanding global dynamical processes planets. However, such observations remain limited. Using simultaneous data from Tianwen-1 Mars Atmosphere Volatile Evolution (MAVEN) mission, we present, first time, dynamic...

Spectral domain optical coherence tomography (SD-OCT) has recently attracted a lot of interest in the pharmaceutical industry as fast and non-destructive modality for direct quantification thin film coatings that cannot easily be resolved with other techniques. While previous studies SD-OCT have estimated intra-tablet coating uniformity, estimates were based on limited number B-scans. In order to obtain more accurate estimate, greater B-scans are required can quickly lead an overwhelming...

Efficient fiber-to-chip coupling is a key issue in the field of integrated optics and photonics due to lack on-chip silicon light source at present. Here, we propose silicon-based edge coupler by use subwavelength grating (SWG)-assisted structure. The conversion region composed trident-shaped SWG center two matched strip waveguides on both sides. To achieve high mode match between fiber waveguide realize low-loss transmission on-chip, have divided into three parts determined their optimum...

Oxygen vacancy (VO) is a kind of primary point defect that extensively exists in semiconductor metal oxides (SMOs). Owing to some its inherent qualities, an artificial manipulation VO content one material has evolved into hot research field, which deemed be capable modulating band structures and surface characteristics SMOs. Specific the gas-sensing area, engineering sensing materials become effective means enhancing sensor response inducing light-enhanced sensing. In this work,...

On-chip polarization management components play a critical role in tackling dependence the lithium-niobate-on-insulator (LNOI) platform. In this work, we proposed reconfigurable TE-pass polarizer based on optical phase change material (GST) and LNOI wafer. The key region is formed by hybrid GST-Si3N4 layer symmetrically deposited atop centerline of waveguide along propagation direction where GST sandwiched middle Si3N4 layer. Whether will take effect depends states graphene aluminum oxide...

Abstract In this paper, we report the use of femtosecond radially polarized vortex laser with MHz repetition rate for direct writing cladding waveguides (WGs) and realization waveguide oscillations in ytterbium-doped calcium fluoride crystal. The negative refractive index modification Yb:CaF 2 crystal is fabricated by homemade all-fiber amplifier. At 976 nm pump wavelength, these WGs can achieve continuous-wave (CW) oscillation. length resonant cavity 4 mm, minimum threshold 116 mW,...

A mode-order converter is an indispensable component in some typical on-chip mode-division-multiplexing (MDM) systems. Here, we propose a compact and high-performance TM-polarized using shallowly etched structures on the silicon waveguide. This device consists of rhombus etching part at waveguide center two same triangle parts both sides along propagation direction to achieve mode conversion from input ${{\rm TM}_0}$TM0 output TM}_2}$TM2 mode, where effective structure corresponding index...

The oriented design and controllable preparation of sensing materials are extremely important meaningful attributes that not only contribute to the realization desirable gas-sensing properties but also facilitate validation mechanism. Because spatial effect derived from micelle assemblies formed by surfactant molecules under certain circumstances, radial growth ZnO crystals is successfully suppressed in this work, which leads formation nanowires with a larger aspect ratio. Furthermore,...