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Spectral-domain optical coherence tomography (SD-OCT) is used clinically for the diagnosis and management of glaucoma, with the internal limiting membrane (ILM) being one important structure of interest as it reflects the upper bounding surface of the optic cup. In cases of severe glaucoma, the boundary of the optic cup can become very steep and difficult to segment. Because of this difficulty, current...
In this study, we firstly analyse the requirements both in optical and thermal fields in theory. With the results of theoretical analysis, we design the application specific light emitting diode (LED) packaging (ASLP) with optimized structure parameters and appropriate packaging materials. According to this design, several samples are made and tested. The test results show that the LED packaging can...
Low light extraction efficiency (LEE) is one of the most challenging points for light-emitting diode (LED) array packaging. Analysis of LEE enhancement of LED array packaging with micro-structures on packaging silicone is presented. To obtain high LEE, micro-structures including inversed cone, inversed frustum of a pyramid (FP) and V-groove are introduced. Two types of LED chips consisting of conventional...
LED's luminous efficiency increases rapidly in recent years, many novel illumination applications with LEDs are emerging. Based on the analysis of LED's characteristics, our optimization scheme and design methods for LED taxiway lamps are proposed. A novel LED lamp using in navigation of the taxiway of the airport is designed as an example. The simulation results demonstrate that the light utilization...
The electrophoretic display (EPD) has become the main solution to electronic paper, but it is temperature sensitive with only a few number of gray levels. In this paper, we present an integrated image tool to automatically estimate the reflectance function curves under different temperatures, perform adaptive image halftoning to improve visual quality, and calibrate the image to compensate the nonlinear...
Structure Function Method (SFM) is discussed through choosing optimal structure function formula, distance value and window size, and is used to retrieve aerosol optical thickness (AOT) over Beijing and its surrounding area in this paper. 6SV1 is chose to create look-up table. Effect of polarization for different aerosol models is studied in detail in the paper, and results show that polarization...
We experimentally demonstrate the pushing of gold nanoparticles by surface plasmon polaritons (SPPs). 2D FDTD simulations indicate considerably enhanced optical forces due to SPPs and gold particle-film interaction, in comparison to total internal reflection illumination.
The color uniformity is a critical index in the evaluation of high quality white light emitting diodes (LEDs). The main factor affecting the color distribution is the state of the phosphor. The secondary factor is the optical structure. This paper analyzes two parameters of the phosphor layer (thickness and concentration) and six optical structures. Results indicate that the structures with reflector...
Optical analysis is critical to the evaluation of an LED MR16 lamp, especially when the lamp is still in its early stage of development and applications and when optimization is needed for making use of unique characteristics of LEDs. In this study, optical research of a 3W LED MR16 lamp was conducted. The experimental results demonstrated that the LED MR16 lamppsilas angle of full width at half intensity...
The state of phosphor will greatly influence the packaging performance such as luminous efficiency, quality of white light and color uniformity. The analysis presents that the small variations of thickness and concentration could significantly influence the light extraction efficiency and the correlated color temperature (CCT). With the increase of thickness and concentration, the light extraction...
The green InGaN-based resonant cavity light-emitting diodes (RCLEDs) on Si substrates were fabricated using laser liftoff and wafer bonding techniques. Five-pair TiO2--SiO2 distributed Bragg reflectors (reflectivity: 85%) and an Ag metal layer (reflectivity: 99%) were employed as the top and bottom mirrors, respectively. The light output power of the RCLED at room temperature is 1.5 times the magnitude...
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