Functional polymeric films with antireflective and hydrophobic properties have been widely used for electronic device displays. However, the design of such functional an antimicrobial characteristic has a challenge. We designed nanostructured surface using rigorous coupled-wave analysis to obtain period 300 nm aspect ratio 3.0 on flat poly(methyl methacrylate) film. The fabricated nanostructure was exhibited desired optical characteristics reflectance less than 0.5% over visible wavelength...

In this study, we develop an ultra-fast fiber Bragg grating sensor system that is based on the Fourier domain mode-locked (FDML) swept laser. A FDML wavelength laser has many advantages compared to conventional source, such as high-speed interrogation, narrow spectral sensitivity, and high phase stability. The newly developed shows a superior performance of scan rate 31.3 kHz broad range over 70 nm simultaneously. interrogating using characterized in both static dynamic strain responses.

Electroencephalography (EEG) is a portable brain-imaging technique with the advantage of high-temporal resolution that can be used to record electrical activity brain. However, it difficult analyze EEG signals due contamination ocular artifacts, and which potentially results in misleading conclusions. Also, proven fact artifacts cause reduce classification accuracy brain-computer interface (BCI). It therefore very important remove/reduce these before analysis for applications like BCI. In...

Steady-state visual evoked potentials (SSVEPs) have been extensively utilized to develop brain-computer interfaces (BCIs) due the advantages of robustness, large number commands, high classification accuracies, and information transfer rates (ITRs). However, use several simultaneous flickering stimuli often causes levels user discomfort, tiredness, annoyingness, fatigue. Here we propose design a stimuli-responsive hybrid speller by using electroencephalography (EEG) video-based eye-tracking...

We demonstrated a linearized wavelength interrogation system of fiber Bragg grating (FBG) strain sensors, based on wavelength-swept active mode locking (AML) laser. Since the sweeping mechanism AML laser does not depend selecting filter, we can easily demonstrate wavelength-linear by applying programmable electrical signal to cavity. Both static and dynamic measurements FBG sensors were characterized with high linearity, which has an R-square value 0.9999 at sweep rate 50 kHz.

It is a fact that contamination of EEG by ocular artifacts reduces the classification accuracy brain‐computer interface (BCI) and diagnosis brain diseases in clinical research. Therefore, for BCI applications, it very important to remove/reduce these before signal analysis. Although, EOG‐based methods are simple fast removing but their performance, meanwhile, highly affected bidirectional process. Some studies emphasized solution this problem low‐pass filtering EOG signals using them...

Functional near-infrared spectroscopy (fNIRS) is an emerging non-invasive brain imaging technique and measures activities by means of light 650-950 nm wavelengths. The cortical hemodynamic response (HR) differs in attributes at different regions on repetition trials, even if the experimental paradigm kept exactly same. Therefore, HR model that can estimate such variations objective this research. canonical function (cHRF) modeled two Gamma functions with six unknown parameters (four them to...

Drowsiness/sleepiness is a serious issue that needs to be addressed for improvement in the safety of road driving. Past statistical data on accidents has shown enormous increases car crashes due drowsy/sleepy feelings. This study comprehensively summarizes all aspects drowsy state and its effects during driving: symptoms, causes, preventive actions, accident statistics, sleep stages, behavioral, physiological neural activation changes occurring wakefulness state. It considers drivers'...

Abstract Plasmonic effects that enhance electric fields and amplify optical signals are crucial for improving the resolution of imaging systems. In this paper, a metal-based plasmonic nanostructure (MPN) is designed to increase an system by amplifying specific signal while producing effect via dipole nanoantenna (DN) grating (GN), which couple field be focused at center unit cell. We confirmed MPN enhances 15 times more than DN GN, enabling acquisition finely resolved signals. The...

The static and dynamic characteristics of a wavelength-swept active mode locking (AML) fiber laser are presented in both the time-region wavelength-region. This paper shows experimentally that linewidth spectrum bandwidth sweeping wavelength dependent directly on length dispersion cavity as well modulation frequency rate under mode-locking condition. To achieve narrower linewidth, longer higher order condition required simultaneously. For broader bandwidth, lower is using frequency....

Abstract Drowsy driving is a common, but underestimated phenomenon in terms of associated risks as it often results crashes causing fatalities and serious injuries. It challenging task to alert or reduce the driver’s drowsy state using non-invasive techniques. In this study, drowsiness reduction strategy has been developed analyzed exposure different light colors recording corresponding electrical biological brain activities. 31 subjects were examined by dividing them into 2 classes, control...

A simple optical signal demodulation technique is demonstrated for multi-point interrogation of fiber Bragg grating sensors. The wavelength-division responses polarization-maintaining Sagnac loop filters are flexibly controlled to interrogate the simultaneous intensity changes from independent wavelength shifts multiple Experimental performance also show detection separated FBG sensing signals by individual photo detectors.

We present an automated and systematic two-dimensional discrete Fourier transform (2D-FFT) approach to analyze collagen fiber organization through the use of second harmonic generation (SHG) microscopy. Average orientations individual domains Ising-like order parameters introduced characterize correlation between adjacent may be used quantitatively fibrous tissues. Our was applied tissues including rat tail tendon, mouse skin, bovine corneas, human corneas. also show that in normal...

As discussed in this paper, a practical optical backplane system was demonstrated, using waveguide-embedded board, processing boards, and slots for board-to-board interconnection. A metal bench used as packaging die the devices integrated circuit chips both transmitter receiver boards. The polymer waveguide produced by means of hot-embossing technique then embedded following conventional lamination processes. average propagation loss these waveguides approximately 0.1 dB/cm at 850 nm....

Despite advances in diagnostic and therapeutic technology of human diseases, cancer remains among the leading causes morbidity mortality worldwide. The development molecular imaging has made it possible to diagnose treat at early stages, which increases likelihood survival. Nuclear medicine played a key role diagnosis staging malignancy. However, most can only be used preoperative stage, these methods are time consuming often expose patients high amount radiation. Combined with appropriate...

functional near-infrared spectroscopy (fNIRS) has evolved as a neuro-imaging modality over the course of past two decades. The removal superfluous information accompanying optical signal, however, remains challenge. A comprehensive analysis each step is necessary to ensure extraction actual from measured fNIRS waveforms. slight change in shape could alter features required for fNIRS-BCI applications. In present study, effect differential path-length factor (DPF) values on characteristics...

Roll-to-roll nanoimprint lithography (RTR-NIL) is a low-cost and continuous fabrication process for large-area functional films. However, the partial ultraviolet (UV) resin filling obstructs ongoing production process. This study incorporates UV into nanopillars nanopores by using RTR-NIL. A multiphase numerical model with sliding mesh method proposed in this to show actual phenomena of imprint mold rotation feeding on polyethylene terephthalate (PET) substrate. The implementation under...

Development of an integrated robotic chemistry system and customized software for the automated operation complete split-pool procedures.

We propose and experimentally demonstrate a voltage-controllable add-drop multiplexer with tunable coupler based on long-period fiber gratings (LPFGs). The is cladding mode coupling between two parallel LPFGs divided coil heaters, which controls the resonant wavelength positions of LPFGs. tunability measured to be -0.45 nm/degrees C in temperature range from 20 120 degrees C. large tuning optical signals (approximately 50.54 nm) 1502.32 1552.86 nm, covers both short (S) conventional (C)...

We proposed and experimentally demonstrate a simple flexible scheme of all-fiber Fabry-Perot filter with continuous free spectral range tunability exploiting superimposed chirped fiber Bragg grating. Then, we apply the continuously tunable multichannel to multiwavelength SOA ring laser at room temperature. The specially designed apparatus can induce symmetrical strain gradient modify chirp ratio along grating attached onto cantilever beam. Then be controlled by variation reflection bandwidth...

We demonstrate an individually-switchable multi-wavelength fiber ring laser using semiconductor optical amplifier with novel switchable band-pass filters. The filter is based on a Sagnac loop interferometer incorporating both Bragg gratings and polarization controller. proposed shows high output performance of independent switching at arbitrary lasing wavelength extinction ratio for wavelength-division multiplexing source.