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Vertical Cavity Lasers (VCSELs)

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The goal of this proposed project is to develop a revolutionary semiconductor laser transmitter technology, based on the homogeneous integration of photonics and electronics. The new device, a TX-VCSEL, is the integration of a high frequency Heterojunction Bipolar Transistor (HBT) with a Vertical Cavity Surface Emitting Laser (VCSEL).
We are designing a Vertical-Cavity Surface-Emitting Laser (VCSEL) structure, containing a Sub-Wavelength Grating (SWG) and a Photonic Crystal (Phc) slab, either of which might replace one of the Distributed Bragg Reflectors (DBRs), using Finite-Difference Time-Domain (FDTD) and a transfer matrix method.
We are fabricating high-speed VCSELs in GaAs for 850 nm emission. Multi-wavelength VCSEL arrays are being developed. The fabrication is carried out in the AMPEL Nanofabrication Laboratory. We are currently fabricating devices based on sub-wavelength gratings (see e.g. Optics Express 2006 article).
Optical injection locking uses a second (master) laser to inject photons at a similar wavelength into the transmitter laser (termed follower or slave). Under certain conditions, the follower laser is locked in phase to the master, and the laser dynamics fundamentally change and can result in far better device performance.
This research project aims to develop an implantable, biocompatible, optical glucose monitor, which would have a tremendous health-care benefit, providing an improved glucose-monitoring tool for diabetics. It is based on semiconductor laser sources (VCSELs) at the ideal wavelength for optical glucose sensing.