Session Index

Augmented Reality (AR) displays are attracting significant attention and efforts recently. One of the solution to compromise both the time multiplexing and Vergence-Accommodation Conflict (VAC) is the Varifocal lens (VFL) based approach. This report addressed four major challenges on VFL-AR system, and the results suggest feasible treatments for better user experiences.

 

The frequency-resolved optical gating (FROG) is powerful technique for measuring the ultrashort laser. However, the reconstruction algorithm based on iterative process lowers the detection rate. In this paper, utilizing the time and frequency constrains, we can estimate the initial electrical function of amplitude and phase to improve the convergence rate.

 

The purpose of this paper is to focus on the design of the optical module of LED projection headlight with an asymmetric light-guide and remove the shield. We propose three structures and optimize them, including coaxial, curved and combined light-guide.

 

In this paper, we proposed an optical design for both high beam and low beam in a single reflector. The performance of the final design has been proven both meeting the regulation in simulation and experiment. The maximum illuminance reaches to 396 lux in simulation and 226.8 lux in measurement.

 

Adaptive headlight system is an optical control technology that can adjust the light distribution of headlight depending on the driving environment. This system utilizes multiple collimated light to assemble automotive lighting areas with pixels. The distribution of the headlight can be changed when controlling the greyscale of the pixel.

 

Bio-lasers are emerging technology for next generation biochemical detection and biophotonic applications. Recently, laser-based detection has been exploited as a novel tool in biosensing due to their capability to amplify subtle changes in the gain media caused by underlying biological processes. Laser emission has unique merits over fluorescence, including threshold-gated emission, narrow linewidth, and strong intensity, leading to ultrasensitive detection of intracellular dynamics, and superior contrast for higher spectral/spatial resolution imaging. In this talk, I will introduce the recent advances of biolasers in cells, tissues, and neuronal networks, by using several types of micro laser cavities, such as optofluidic ring resonators and high-Q Fabry-Pérot mirrors. Next, we demonstrate the possible implementation of biolasers into an automated lasing system for systematic and statistical analysis, including an integrated cellular laser array device and laseremission microscopy for cancer screening and immuno-diagnosis. Furthermore, optical recording of calcium transients during spontaneous neuronal activities was first demonstrated via neuron lasers with a significantly improved sensitivity, not only for monitoring neuronal network dynamics but an ultra-sensitive detection method for brain-on-chip applications and neuro-analysis. Finally, discussion and outlook is made on the strategies through biolasers and to pioneer novel on-chip devices for future clinical diagnosis, prognosis, and fundamental research in biomedicine.

 

Light is not only for human vision but may also be a non-pharmacological method to improve the sleep cycle and quality life of people who have to live with dementia. Using LEDs, we have designed a 24-hour lighting timetable to simulate changes in daytime spectra for installation in long-term care.

 

A highly sensitive open-cavity fiber Fabry-Pérot interferometer (FPI) sensor is proposed by splicing an etched MMF with a HCF through a large offset of 50m. The measured refractive index and pressure sensing sensitivities are 1313.2 nm/RIU and 25.33 pm/psi, respectively, with very good linearity.

 

We deform a honeycomb lattice by shrunken or expanded the structure to induce the band inversion, which leads to a topological transition. At the boundary of nontrivial and trivial topological structure, we numerically demonstrate the characteristics of one-way propagation.

 

The stray light intensity arc of a retinal image in a fundus camera is analyzed. Besides the optimization of the hole mirror design, the impact of the hole mirror chamfer on the stray light intensity arc is also analyzed to preserve a clear retinal image in a fundus camera production.

 

The femtosecond laser gained a reputation as a reliable and extremely precise tool for micro- and nanofabrication. Here we present our recent work in applying and finetuning fabrication techniques in several aspects, namely the significant enhancement of 3D resolution, dynamic throughput manipulation via shaping the laser beam and spatial light modulation, as well as combining laser processing with other established manufacturing techniques. Finally, additive 3D nano-manufacturing of non-organic structures is discussed, explaining the undergoing physical phenomena, and showing examples of produced 3D objects. In conclusion, we demonstrate yet another example of laser 3D processing being a powerful tool for advanced fabrication with far-reaching implications in various fields.

 

The optimum combination of three glass materials is obtained for correction of chromatic aberration using the three- prism combination Illustrating method and optimization program.

 

A white LED with a luminous flux of 146lm is used in this low beam vehicle light design. The design includes two prism arrays, a compound reflector, and a toroidal lens which was modified to correct the light pattern. The total received lumens was 123.9lm and the efficiency was 85.86％.

 

We discuss the relative illumination for a large-aperture projector lens design. The EFL and f-number are 24.06mm and 1.741, respectively. The screen size is 206inches and the max-aperture is 74.86mm. We also derive the relative illumination equations for interface transmission, internal transmission and solid angle. The relative illumination is 98.7%.

 

The periscope zoom lens depth depends either on the prism thickness or the maximum aperture of the zoom lens in the Y-direction. To reduce the periscope zoom lens depth to 5mm for an 8-Megapixel device, we use a 16:9 aspect ratio sensor with a rectangular aperture.

 

This study is to simulate the retinal peripheral refraction of emmetropic and myopic eyes when wearing correction spectacles at distance and near views. The results show that the myopic spectacle could enhance the retinal relative peripheral hyperopic refractions.

 

An innovative dual-frequency double-diffraction type laser interferometer based on coplanar detection design is proposed. The proposed method takes “grating” as the core of technology development. By integrating the advantages of heterodyne dual-frequency interferometry and coplanar detection double-diffraction optical design, the system has high resolution, high repeatability and multi-degree-of-freedom measurement capabilities.

 

The study explored and implemented image reconstruction of three-dimensional diffuse optical tomography using synchronous multi-frequency driving light source. To the purpose square waves were employed so that multiple sets of light intensity and phase lag information can be obtained in a single measurement.

 

A portable laser pest control system employing deep learning for Caterpillar head identification using YOLO was developed. On detecting the head, laser beams were utilized to render the caterpillars powerless. On-field testing was performed for the system and the results were noted.

 

A hybrid Si photonics integration has been used in developing interferometric fiber optics gyroscope on silicon photonics template. An on-chip Si photonic chip has been used as optical driver of IFOG. With employing wafer bonding technology, efficient optical coupling into Si waveguide has been realized by on-chip integration of SLD. Different SLD optical coupling schemes by hybrid integration will be discussed.

 

This study proposes a novel LGP design with unilateral light emission, which is applied to a curved LED luminaire without reflective sheet. The LGP adopts convex cylindrical features of ϕ1×0.7 (mm), which provides 90% illuminance on the feature side of LGP. A prototype is presented to verify the design.

 

A differential interference contrast microscope (DICM) is proposed . It is the same as a phase-shifting polarizing microscope except one liquid-crystal Savart prisms inserted in between the objective and sample and it possesses an advantage over conventional DICM of without mechanical movements when switching shear directions.

 

A freeform lens construction is proposed to form a specific rotation symmetric beam profile with collimation. The freeform surface is constructed segment-by-segment using a numerical method based on Snell’s law to produce an output beam profile which has both good irradiance user-defined profile and high collimation.

 

In this paper, we describe a design methodology combining ray tracing, FDTD simulation, S-parameter method, and near-to-far-field transformation to establish a standard operation process for designing metalenses system with sub-wavelength structures. The results show a telephoto lens with FOV  20o and thickness less than 6 mm.

 

Volume holographic optical element (VHOE) has been shown its potential to modern IT devices, including near-eye glass. A designer, however, has no an effective approach to design a useful VHOE. The reason is that there are two remain problems which must be solved in the design approach. This talk is aimed to discuss these two problems and the potential solutions will be proposed.

 

This paper build a measurement system, it has both high resolution and fast image recognition. In this system, a 4K line scan camera connects a macro lens with a focal length of 60 mm, and a linear light source is used to measure surface defects of the object.

 

The photorefractive effect is used to manipulate polychromatic spectra. A sinusoidal phase grating is used to diffract polychromatic light. Theoretical analyses and numerical examples show that for different detection angles, the diffracted spectrum exhibits different features, and that specific spectral line selection or line filter effects are achieved.

 

Two-component finite conjugate zoom lenses are widely used in optical systems. Suitable combinations of the component focal lengths are essential for giving successful zoom curves. The solution spaces of the component focal lengths for solving the real and positive thickness from the first to the second components are described.

 

We present a telecentric design to obtain constant magnification with long axial scanning range in optical sectioning microscope. A Moiré lens is designed and used for this purpose. Design principles of our system are explained through mathematical expression and simulation results are provided for different conditions.

 

A cost effective optical design for colorimetric pyrometer was developed for laser-based additive manufacturing facility. Equipped with diffraction gratings and fiber array element, the colorimetric pyrometer has its robustness in sensing wavelengths and number of channels which is adaptive for characterizing thermal radiation from mixtures of black/gray bodies.

 

This study proposed a novel common path linear encoder. By combining with double-diffraction, interferometry, grating interferometry and common optical path techniques, the system can precisely measure in-plane displacement, while having the advantages of high sensitivity, high stability, high tolerance and has been miniaturized successfully.

 

In this work, we proposed a plasmonic Huygens metasurface with a state-of-the-art circular polarization conversion efficiency beyond 50% at telecom wavelengths. We highlight the feasible applications of our high-performance metasurface via demonstration of a beam deflector and a focusing metalens.

 

In this paper, we demonstrated a hybrid of optical fiber and free-space optics (FSO) for optical access networks. The experimental result proves that the hybrid of 25 km SMF with free space optic link increases the communication coverage range with a reasonable performance.

 

We have designed precise and fast Gated Recurrent Unit (GRU)deep learning model to detect the Bragg sensor wavelengths from the reflected overlapping spectra within the sensor network.The performance of the proposed model is good, even when the FBG sensor number is increased and the spectra is completely overlapped.

 

he plant water content changes, it also changes the chlorophyll concentration. Therefore, we study the use of chlorophyll fluorescence to combine the fiber and improve the previous structure. By fixing the fiber to the surface of leaf to determine the water content by sensing the change of chlorophyll fluorescence.

 

In this study, a special lampshade with a different structure is used to generate a UV LED inducing mosquito system. UV LED uses a specific wavelength of light (365nm UV LED) and matches the black appearance, as well as a solar energy-saving switching device, which maximizes the incentives. .

 

Smart phones equipped with biometric systems have become a trend. Fingerprint recognition is most common in biometrics. We propose a novel concept to design a full-screen optical fingerprint recognition system. The principle of optical fingerprint recognition mainly requires the calculation of Fresnel equation.

 

This study uses Solidworks for optic to draw and simulate a lens package for LED head light. This lens shape is made from an ellipse around a circle. By adjusting the size of the circle and the ellipse appropriately, the best with the latest head light regulation ECE R113.

 

A CGH component is designed for testing a large aspheric mirror as a part of its manufacturing process, with assist features are to assist in proper alignment to minimize alignment error.

 

Because of the long detection time and the generation of consumable waste liquid. Our developed is to integrate optical detection technology, IoT system, cloud construction and AI algorithm to develop an online concentration analysis system of one ion (copper, nickel, iron, chlorine), which is an important application for smart manufacturing.

 

We proposed a method for small polarization rotation measurement that is based on the use of a half-wave plate and a high-stability common-path heterodyne interferometry, When the azimuth angle at 22.5 degree of a half-wave plate, the phase has a distinct change caused by the the incident light.

 

This research is a headlight simulation using diode lasers combined with a Digital Micromirror Device (DMD). Use fast axis and slow axis collimator (FAC/SAC) to collimate the diode laser. Establish a lens (LENS2) to enlarge the light projection angle to comply with ECE R113 Class D, E high beam regulations.

 

In this study, a projector type headlamp using LEDs is proposed to be the vehicle lamp with integrated low-beam and high-beam light. The design of low-beam LED headlamp with a top ellipsoidal reflector and a baffle plate is used to achieve a LED headlamp with a low-beam cutoff line.

 

We demonstrate a laser that is prohibited to emit at a particular wavelength, called a dark line, in the emission background of its gain spectrum. The dark line laser is generated from the high-loss resonances of a 150-μm thick etalon mirror in an ytterbium doped fiber laser.

 

We numerically analyzed the bound states in the continuum (BICs) in 1D periodic metallic bar structures and found the accidental BICs. By changing the parameters of the metal structure, we verify the topological nature of the BICs which move along the Brillouin zone and persist under fine-tuning.

 

We demonstrated the NH3 gas sensing by means of DFB tunable laser coupled with a photoacoustic cell near 1550 nm. The detection limit of NH3 was estimated to be 25 ppm. Furthermore, in the flowing system, the noise can be restrained by using differential photoacoustic detection.

 

In this study, the spherical aberration is eliminated via a free-form phase correction function designed by using Zemax. In the measurement, we add the phase function into a SLM. The spot size is reduced 23%. In the future, a metasurface for eliminating the aberration will be fabricated and measured.

 

The home-made Shack-Hartmann wavefront sensor (SHWS) returns the coefficients of 8 primary Zernike modes representing the optical aberrations. Based on the identified model of the deformable mirror in the adaptive optics system (AOS), we implement optimized digital controller to rapidly compensate the aberrations and restore the laser focusing spot quality.

 

The authors present holographic recording of slow-motion pictures of light propagation. The motion picture of not only 2D image but also 3D image of light propagation with the temporal resolution of 96 femtoseconds are demonstrated.

 

A new counter beam light (CBL) with a 400W high pressured Sodium lamp was proposed for CIE:88 2004 regulated tunnel road lighting use. The optical component of the CBL was an optical reflector built by three curved metallic surface to control the beam pattern of the light.

 

We demonstrate the fabrication of the photo-aligned liquid crystal device and the characteristics of tunable phase retarder. We demonstrate two different subtract the fabrication and characteristic of AP(Anti parallel) LCD. The electro-optical properties and the transmittance change depending on the driving voltage are measured and discussed.

 

This study investigates the optical design of the planar LEDs using light shaping diffusers. Glare Control diffusers exhibit a variety of appearances depending on illumination conditions.

 

A LED light is proposed and demonstrated to serve as the counter beam light in tunnel lighting. Making use of a secondary freeform lens owning two curved surfaces and one flat metal reflecting surface to control a 150W LED emitting rays

 

This paper presents the optical model for a type of LED emitting a wavelength of 275 nm and the design of Fresnel lens with an acceptable optical utilization factor. We compare the results achieved between the simulation and the corresponding experiment.

 

The study demonstrates the packaging for polarization maintain fiber lens and pump laser and the results show that the relationship between fabrication tolerance and coupling efficiency and the relationship between fabrication tolerance and extinction ratio.

 

A mosquito-collecting component that can be externally attached to the air inlet of a light-emitting diode mosquito-trapping system was developed to optimize the efficiency of the mosquito-trapping lamp and increase mosquito-trapping capacity. Used the three-dimensional computer-aided design software SolidWorks to build the system Finally,data obtained, mosquito-trapping efficiency was optimized.


 

The fringe-resolved autocorrelator is a widely adopted system for measuring the
ultrashort pulse characteristic. Based on the nonlinear optical response of the light-emitting
diode (LED), we can build a low-cost fringe-resolved autocorrelator. The automation can be
achieved by synchronizing the reference beam movement and the photocurrent detection based
on LabVIEW.


 

We take carbon quantum dots, which are environmentally friendly and fluorescent colloidal quantum dot materials, as the research direction, and explore the effects of different solvents on their properties.

 

The study explores and compares the reconstructed diffuse optical images using fixed and flexible detection channels. The results exhibit the quality of reconstructed images were obtained since the scanning platform with flexible detection channels performing radial displacement may conform to the contour of breast.

 

We use plastic optical fibers to make optical fiber ranging sensors and install them on the robotic arm to help determine the robot arm to grip the target. Based on the characteristics of the optical fiber ranging sensor, develop an algorithm for the mechanical arm to grip the soft object.

 

A portable AI-assisted remote camera-based attack system is proposed for detecting potential threat. The system is composed of two webcam, two Raspberry pi, an air compressor, a pistol and a Google coral USB accelerator. Compared with conventional surveillance systems, this remote camera- and AI-based system possesses more flexibility and precision.

 

The Shack-Hartmann wavefront sensor (SHWS) is a powerful tool to monitor the optical wavefront and decomposed into Zernike modes in real time. We have shown that using the center detection algorithm doesn’t only improve the analysis accuracy but also allow the wavelength detection range cover from ultraviolet to visible band.

 

The sensing properties of negative curvature hollow-core photonic crystal fiber sensor by measurement are presented. The spectrum of the hollow-core photonic crystal fiber sensor is from sensing to different materials. The power loss is decreased as the refractive index of materials increased and having flattened variation at 1545-1560 nm wavelengths.