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The Maryland Optics Group

Introduction

Research in the Maryland Optics Group covers a broad range of topics including Free Space Optical (FSO) Communications, biosensors, near-field antenna characterization, nano-optics, plasmon spectrosocopy, and fiber and free-space laser interferometry. Coherent, hybrid, homodyne and heterodyne fiber sensors have been studied that can be used for remote electrical and magnetic field measurement, for mapping the surface structure of optical components with high spatial resolution, and for identifying patterns of birefringence in GaAs and related electronic and photonic devices. We have extended the ideas of scanning tunneling optical microscopy (STOM) or near-field (evanascent field) microscopy with our heterodyne single-mode fiber probes. By tapering an uncoated fiber to a taper on the order of 100nm in diameter we have been able to build a scanning microscopy, with sub-optical (approx. 100nm) resolution.

Free space interferometry is being applied to studies of atmospheric turbulence and to the detection of interesting molecules in the atmosphere at very low concentrations (< 1ppb). Our research is also directed at improving, and understanding better, the laser sources that perform best in ultra-sensitive coherent sensors. To this end we have been constructing novel diode-pumped Nd:YAG lasers that operate in as dual-frequency mode, and are making detailed studies of their noise performance, control, and stabilization. To provide compact, high-brightness pump source for these lasers we have been studying the injection locking of broad-area diode lasers with the production of substantial power in a diffraction-limited lobe. We have also been developing incoherent and coherent fiber optic probes for biomedical applications.

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