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This technology allows a dual-functional optical probe that operates both as optical imager and multi-site stimulating probe. The working principle for this device is based on the optical reversibility in which the spatially resolved imaging or stimulation function is attained via mode division multiplexing in a light guide or waveguide structure. The probe consists of a light source array, an imaging pixel array, an optical mode multiplexer/demultiplexer, segmented waveguides, and multiple optical elements.