Li-Wei Tu

Title: Innovations of Li-Wei Tu in Light Emitting Diodes and Lasers

Introduction

Li-Wei Tu is an accomplished inventor based in Westfield, NJ (US), known for her significant contributions to the field of optoelectronics. With a total of four patents to her name, she has made remarkable advancements in light emitting diodes (LEDs) and vertical cavity surface emitting lasers (VCSELs). Her work has paved the way for improved optical devices that enhance light emission characteristics.

Latest Patents

One of Li-Wei Tu's latest patents is for a light emitting diode that features a resonant Fabry-Perot cavity. This innovative design includes an active layer and confining layers, resulting in higher spectral purity and light emission intensity compared to conventional LEDs. The structure utilizes a highly reflective multilayer distributed Bragg reflector (DBR) mirror and a less reflective top mirror, which together improve the directional light emission characteristics. The use of this resonant cavity allows for optical spontaneous light emission that is restricted to the modes of the cavity, enhancing the overall performance of the LED.

Another notable patent involves optical devices with electron-beam evaporated multilayer mirrors. This invention focuses on a Vertical Cavity Surface Emitting Laser that incorporates a top mirror made of quarterwave layers. The high index of refraction layer is selected from semiconductors like GaP and ZnS, while the low index layer is chosen from materials such as borosilicate glass and CaF2. This mirror structure significantly improves the reflectivity and efficiency of the laser, representing a considerable advancement over previous designs.

Career Highlights

Li-Wei Tu has built her career at AT&T Bell Laboratories, where she has been instrumental in developing cutting-edge optical technologies. Her work has not only contributed to the advancement of LED and laser technologies but has also positioned her as a leading figure in the field of optoelectronics.

Collaborations

Throughout her career, Li-Wei Tu has collaborated with esteemed colleagues, including Erdmann F. Schubert and George J. Zydzik. These collaborations have further enriched her research and innovations in the field.

Conclusion

Li-Wei Tu's contributions to the fields of light emitting diodes and vertical cavity surface emitting lasers have significantly advanced optical technology. Her innovative patents reflect her expertise and commitment to enhancing light emission characteristics, making her