Chang-Sheng Chu

P-184: Novel Diffuser for LCD Backlight Application

A plastic diffuser with high-aspect-ratio surface profile for application of LCD backlighting is proposed. It can diffuse light uniformly into wider angle than that from a conventional bead-embedded diffuser. The diffusion power of the proposed diffuser and the fabrication processes are also presented.

P‐83: Side‐emitting LED for Ultra‐Thin Direct LED Backlight

A LED direct backlight system with ultra-thin thickness by employing side emitting LEDs is proposed. The lens cap on the LEDs is with metal reflection coating to re-direct the light to emit from the side of LED. Prior to this method, the light mixing cavity of a LED Backlight module is thicker than 50mm for obtaining uniform illumination. By using the proposed LED package, a 30mm thick light mixing cavity of a 32″ LED backlight is realized. The simulation and experiment of the illumination performance are also demonstrated.

A finger-free wrist-worn pulse oximeter for the monitoring of chronic obstructive pulmonary disease

Herein, a finger-free wrist-worn pulse oximeter is presented. This device allows patients to measure blood oxygen level and pulse rate without hindering their normal finger movement. This wrist-worn pulse oximeter is built with a reflectance oximetry sensor, which consists of light emitting diodes and photodiode light detectors located side by side. This reflectance oximetry sensor is covered with an optical element with micro structured surface. This micro structured optical element is designed to modulate photon propagation beneath the skin tissue so that the photoplethysmogram signals of reflected lights or backscattered lights detected by the photodetector are therefore enhanced.

New fabrication for DSRRs nanostructure in optics

The Deformed-Split-Ring Resonators (DSRRs) require metal nanostructure on high transmission material substrate for optical application. In this article, a simple method of fabricating three- dimensional polymer nanostructure that use an UV-curable polymer as the resist is discussed. Because UV cure imprinting has high resolution which is about 100nm and high transparency, it is ideally suited for photonic and meta-material optical device applications. The fabrication combines several mass production technologies. The first one is photolithography, such as a stepper UV exposure system can make the nano scale pattern in photoresist, the second is to change the photoresist sample to become the nanoimprint mould by precise electroforming, the third is to use UV cure imprinting to transfer the DSRRs pattern on the UV-curable polymer. Finally, it is also the most important process is that to coat metals and metal lift-off that coating Ag to become buffer layer by sputter, then coating Au into the nanostructure and lift off Ag by HNO3. The DSRR structure is implemented in high transmission UV-curable polymer with Au.