Abstract
We propose a new approach for two-dimensional graded index lenses, based on the one-dimensional compositional grading in III-V compounds ternary alloys. Compositional grading is achieved by the direct writing of these alloys, using the laser-assisted chemical vapor deposition technique. The desired compositional grading and the corresponding variations in the refractive index are achieved by changing the mole fraction of the reactants in the gas phase while scanning the laser beam. An AlGaAs graded index lens structure has been demonstrated for the first time. This III-V compound graded index lens can have potential applications in the field of integrated optics.
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