Feasible Method For Fabrication Research Articles

Formation of Microlens by Reflow of Dual Photoresist

Microlenses have been widely applied in emitters and detectors used in fiber optical communication. Several feasible fabrication methods of microlenses have been reported, namely volume change of a substrate, volume growth in polymethyl methacrylate (PMMA), photoresist reflow method and dripping method. The common concerns are the long processing time and reliability in mass production. The current report presents an innovative process utilizing a dual composite layer to achieve fast and neat fabrication of microball in arrays. The effects of the processing parameter, diameter, thickness of polymer and photoresist, reflow time and temperature have been investigated. The results show that proper heat treatment to achieve high aspect ratio and high thickness of the polymer is essential for making microball lenses.

High-efficiency red and infrared light-emitting diodes using radial outcoupling taper

In this paper, we give an overview of light-emitting diodes (LEDs) with radial tapers. Light is generated in the very center of a circularly symmetrical structure and is outcoupled at a tapered ring. Encapsulated devices with an emission wavelength of 980 nm achieve wallplug efficiencies of 48%. Non-encapsulated InGaAlP-based red-emitting LEDs show quantum efficiencies of 13%. A new device design combines the taper with a wafer-scale soldering technique promising a feasible fabrication method.

ＣＶＤ‐ＳｉＣ連続繊維とそのコンポジット

Since the advent of high-strength, high modulus, low-density boron fiber, the role of fibers produced by chemical vapor deposition (CVD) in the field of high-performance composites has been well established. Although best known for its use as a reinforcement in resin-matrix composites, boron fiber has also received considerable attention in the field of metal matrix composites. Boron/aluminum was employed for tube-shaped truss members to reinforce the Space Shuttle orbiter structure, and has been investigated as a fan blade material for turbofan jet engines. There are drawbacks, however, in the use of boron in a metal matrix. The rapid reaction of boron fiber with molten aluminum and long-term degradation of the mechanical properties of diffusion-bonded boron /aluminum at temperatures greater than 480°C (900°F) preclude its use both for high-temperature applications and for potentially more economically feasible fabrication methods such as casting or low-pressure, high-temperature pressing. These drawbacks have led to the development of the silicon carbide (SiC) fiber.