Here we present additive manufacturing processes (full 3D and 2.5D grayscale modes) to fabricate micro and nano precision optical components for snapshot imaging spectrometers and sensing devices. Specifically we apply 2 Photon Polymerization (2PP) technique to manufacture multifaceted mirrors, arbitrary waveguide/fiber arrays and lenslet array components. All these can be effectively applied in field integral snapshot imaging spectrometers. The fabrication process allows features of 100nm-150nm and surface roughness of 10-20 nm – sufficient for optical quality components. The focus of this presentation is to analyze component designs in context of spatial and spectral sampling, overall part geometry, component performance (throughout, form etc.) and fabrication times. Overall, complete spectrometer dimensions are also discussed in terms of individual element features - unit size (facet, fiber etc.). Presented proof of concept prototypes demonstrate potential for high level integration, small dimensions and design flexibility. Test spectral samples are imaged in VIS spectral range using mapping and fiber array based methods.
Custom fiber arrays can be used to encode 3-dimensional data for snapshot imaging techniques like imaging spectrometry or volumetric spectral domain OCT. This is achieved if array’s input is dense, while its output creates void spaces for spectral information. Here we present fiber arrays with entirely automatic development process based on 2-Photon Polymerization (2PP) additive manufacturing using Nanoscribe GmbH Quantum X system. Specifically, We developed two types of array prototypes: 10x10 to 1x100 and 20x20 - dense fiber spacing (1-2 microns fiber gap) to 20x20 – sparse fiber spacing (30-40 microns fiber gap). Fiber arrays were incorporated into prism-based imaging spectrometer system to demonstrate proof of concept spectral imaging experiments.
2-photon lithography enables custom fabrication of optical waveguides at a sub-micron resolution and millimeter scale. Custom optical fiber architecture is a powerful component for development of fiber coupler systems and advancement of fiber based imaging technology. Here we present an exploration of methods for 2-photon fabrication of optical fibers and fiber coupler systems.
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