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A variety of methods to incorporate optical elements: (a) integrated waveguides forming a y-splitter in PDMS (Ref. 48), (b) a lensed waveguide facet for altering beam divergence (Ref. 45), (c) a fiber sleeve filled with PDMS prepolymer for waveguiding, and (d) the same sleeve with an optical fiber inserted (Ref. 39).
