Company Filing History:
Years Active: 1991
Title: Innovations of Li Wei Tu in Vertical Cavity Surface Emitting Lasers
Introduction
Li Wei Tu is a prominent inventor based in Westfield, NJ (US). She has made significant contributions to the field of semiconductor technology, particularly in the development of vertical cavity surface emitting lasers (VCSELs). Her innovative work has led to advancements in laser efficiency and performance.
Latest Patents
Li Wei Tu holds a patent for her invention titled "Vertical cavity surface emitting lasers with electrically conducting." This invention features a semiconductor VCSEL that includes a lasing cavity with an active layer, a bottom mirror, and a top mirror. The design incorporates front and rear electrodes that apply excitation current parallel to the optical propagation direction. Notably, the front mirror consists of a thin, semitransparent metal layer that also functions as the front electrode. The metal layer is deposited on a highly doped layer, forming a non-alloyed ohmic contact. The materials used for the metal layer include silver (Ag) and aluminum (Al), with thicknesses ranging from 5 to 55 nm. The VCSEL is designed for III-V or II-VI compound semiconductors, and for those with a GaAs active layer, it achieves an impressive external differential quantum efficiency of up to 54 percent, which is the highest recorded in VCSEL structures.
Career Highlights
Li Wei Tu is currently employed at AT&T Bell Laboratories, where she continues to push the boundaries of semiconductor technology. Her work has been instrumental in enhancing the performance of VCSELs, making them suitable for various applications in telecommunications and beyond.
Collaborations
Li Wei Tu has collaborated with notable colleagues, including Dennis G. Deppe and Leonard C. Feldman. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.
Conclusion
Li Wei Tu's contributions to the field of vertical cavity surface emitting lasers exemplify her dedication to advancing semiconductor technology. Her innovative patent and work at AT&T Bell Laboratories highlight her role as a leading inventor in this critical area of research.
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