Session Index

This study develops a fiber-optic sensor based on dual nanoplasmonic structures for refractive index sensing by a CO2 laser engraving. Gold sphere nanoparticles and silver sphere modified the sensor based on dual nanoplasmonic structures in two different fiber sensing zones. This type of sensor has shown the capacity to simultaneously sense two different channels of localized surface plasmon resonance signals with a relatively high refractive index sensitivity.

  Preview abstract

In this study, the 10 nm silver (Ag) was deposited with various deposition rate to investigate the coverage area and the photoelectric response of the silicon-based (Si-based) photodetector at 3.46 µm mid-infrared (MIR) wavelength. However, the response voltage was increased from 0.22 V to 0.88 V (i.e. 4 times enhanced) while the deposition rate reduced. The illuminated area of the metal layer increased when 10 nm Ag deposited at deposition rate 0.1 Å/s, which could generate more hot carriers emitted from metal to semiconductor by the internal photoemission absorption (IPA) mechanism to cause the response voltage enlarged.

  Preview abstract

A disposable PEN based container was fabricated successfully for the liquid concentration variation measurement in a common path heterodyne interferometer. The best measurement resolutions of saline concentration and RI variations are 48 ppm and 8.7×10-6 RIU, respectively.

  Preview abstract

An optical depth sensing was developed in this study. This system is combined with Galileo telescope, micro-lens array, and sensor. The system has been verified its feasibility in the experiment and has the merits of easy to operate and not easily disturbed by external factors and is suitable for combining with various mobile phone lenses.

  Preview abstract

The guided modes of elliptical-tube cladding structure hollow-core fibers with different core diameters, thicknesses, and shapes of capillaries for capillary cladding designs by simulation are presented. The proper number of negative curvature ratios enhances fundamental mode power and the 8-capillary dual-elliptical cladding of NC-HCF is better than the single-elliptical capillary for transmission power.

  Preview abstract

Michelson interferometer (MI) sensor is a highly sensitive and versatile device with extensive applications in optics, fiber communications, temperature sensing, pressure sensing, gas detection, acceleration sensing, and optical signal modulation. However, traditional hardware demodulation techniques are subject to several limitations. In this paper, Using the deep learning model as a demodulation device for Michelson interferometer-based fiber optic signals without the need for complex demodulation circuits. After training and validating the Pix2Pix (P2P) GAN on a large dataset of source images and target vibration signals, the trained P2P GAN model can be used to demodulate vibration signals from the interference signal.

  Preview abstract

Fiber-optic hydrophones are widely used in marine science, military activities, and energy exploration due to their high sensitivity, immunity to electromagnetic interference, and ease of array formation. In recent years, low-frequency detection has become an important research subject for modern fiber-optic hydrophones. In this paper, we design an air-backed mandrel fiber-optic hydrophone and use COMSOL simulation software to investigate its acoustic pressure frequency response in underwater environment. The hydrophone achieves a sensitivity of -136dB (re rad/μPa) with a 3-dB frequency response from 1Hz to 1kHz

  Preview abstract

We present a novel all-fiber Mach-Zehnder Interferometer (MZI) sensor developed by splicing hollow-core optical fiber (HOF) between two single-mode fibers (SMF). Utilizing dip coating and electrostatic self-assembly techniques, the fiber MZI was transformed into a metal ion-sensitive sensor. By adjusting the pH values of Chitosan (CS) and Polyacrylic acid (PAA) in the layer coating, we tuned its refractive index and observed distinct responses and variations to copper ions based on different pH values. This all-fiber MZI sensor demonstrates promising potential for diverse metal ion detection applications.

  Preview abstract

We introduce an advanced optical design, chromatic confocal microscope with nanoscale optical sensitivity, dedicated to examining the spatial distribution of ions inside optical devices. The ions within organic films present in light-emitting electrochemical cells was utilized as a demonstration example. This innovative approach not only enhances our understanding of ion behaviors in such films but also can be applied to studies involving Li-ion batteries and micro-fluid channels, providing a versatile tool for various research arenas to delve deeper into the intricacies of ion interactions and movements.

  Preview abstract

A novel fiber hydrophone is proposed for detecting acoustic-wave signals of underwater. The hydrophone consists of fiber Bragg grating, silicon thin-film, O-ring, and 3D print packaging-structure. The acoustic signal is obtained by means of a photodetector to transform the optical signal of grating-wavelength shift into the electronic signal.

  Preview abstract

This report is to investigate the potential of using high-k gate stack MOS for UV image sensors (hereafter HKMOSUVS) with UV transparent high-k gate stack dielectrics and nanocrystalline conductive gates. We investigate the UV-induced inversion capacity CG measured at the low frequency (LF) capacitance-voltage curve of HKMOSUVS. By adjusting the LF, the HKMOSUVS's sensitivity can be modulated for both small and large signals. ITO gate conductor post-annealing process is used to optimize UV optical transmission. Overall, the use of HKMOSUVS with UV transparent nanocrystalline materials has the potential to the development of superior speed, sensitivity, and resolution UV image sensors.

  Preview abstract

In this work, we fabricate an optically-switchable light valve based on a liquid crystal (LC) cell integrated with a perovskite (PSK) photoactive film. The transmittance of LC/PSK cell can be modulated by the green laser beam without bias voltage via the light-induced thermal effect. The absorption of PSK film by the illumination of green laser results in heat, which affects the phase retardation of LC layer and the resultant transmittance of LC/PSK cell.

  Preview abstract

This study addresses a critical gap in plasmonic surface lattice resonances (SLRs), which have traditionally been limited to longer wavelengths in the visible and near-infrared spectra. We introduce simple yet effective designs optimized for the blue-to-UV range. By leveraging Fabry-Perot mode amplifications and utilizing cost-effective spheroidal aluminum nanoarrays, we theoretically achieve a 42.3-fold increase in Q-factor at a wavelength of 403 nm. This Q-factor is tunable through adjustments to the superstrate cladding thickness. Comparative analyses demonstrate that our designs excel in blue-to-UV wavelengths, enabling higher-resolution biomolecular detection with smaller cross-sections and thereby broadening the empirical utility of SLRs.

  Preview abstract

The n-β-Ga2O3/p-Si heterojunction deep ultraviolet (DUV) photodetectors were successfully fabricated by using RF magnetron sputtering. Optoelectronic properties were studied at various annealing temperatures. Improved crystalline quality was observed with higher annealing temperatures, particularly over 700 °C for β-Ga2O3 (110) phase. The device annealed at 900 °C exhibited the lowest oxygen vacancies. The device annealed at 800 °C showed optimal performance in terms of photo current, dark current, and responsivity.

  Preview abstract

We successfully developed a novel responsive polymer cholesteric liquid crystal interpenetrating polymer network (PCLCIPN) film with controlled porosity, serving as an optical sensor. Its capability to differentiate between methanol and ethanol in alcohol solutions was examined. By observing wavelength shifts in the transmission spectrum at various alcohol concentrations, the optical sensing performance of PCLCIPN was assessed. The central wavelength changes in the PCLCIPN transmission spectrum allowed for accurate discrimination of alcohol concentrations. Notably, the wavelength shift demonstrated a linear relationship with alcohol concentration, enabling precise quantitative analysis of the alcohol solutions.

  Preview abstract

X-ray detection is a highly important detection in the medical field. In this research, we use the non-toxic metal element bismuth (Bi) to replace the lead element (Pb), then choose cesium bismuth halide perovskite derivative, combining the ambient large-area spray-coating to deposit the active layer for the X-ray detector. In this study, we use different process temperatures, two-step heating process, and annealing process to explore the film growth mechanism and measure the electrical properties under various considerations, then verify the influences of the preferred orientation of crystal planes on the electrical properties of the device.

  Preview abstract

Machine learning (ML) is a powerful tool that can be used to drive innovation and applications in flexible electronics. ML can be used to design new materials, develop new manufacturing processes, and optimize the performance of flexible electronic devices. ML has been used to develop new types of flexible displays, batteries, and sensors. ML has also been used to develop new manufacturing processes for flexible electronics that are faster, more efficient, and more affordable. As a result of these advances, flexible electronics are becoming increasingly common in a wide range of applications, including wearable devices, smartphones, and medical devices.

  Preview abstract

In this study, we investigated the potential of porous silicon (PSi) as a material for detecting the chirality and optical activity of organic molecules through its unique anisotropic photoluminescence (PL) properties. We systematically examined the anisotropic PL response of PSi to chiral and spiropyran molecules with different chemical structures and determined their chiral resolution and optical activity by measuring the polarization and intensity of the anisotropic PL. Our results showed that the use of an improved LED light source provided a higher resolution for chiral structures and significantly improved the discrimination of chiral molecules.

  Preview abstract

We developed a facile method for the detection of high mobility group box 1 (HMGB1) using carboxymethyl dextran (CM-dextran) as a bridge molecule modified on the surface of gold nanoparticles combined with a fiber optic localized surface plasmon resonance (FOLSPR) biosensor. Under optimal conditions, the results showed that the FOLSPR sensor detected HMGB1 with a wide linear range , fast response (< 10 min), and a low detection limit of 43 pg/mL and high correlation coefficient values (R^2 = 0.998). Therefore, the present strategy provides a novel and convenient method for chemical and biochemical quantification and determination.

  Preview abstract