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Transmissive silicon photonic dichroic filters with spectrally selective waveguides

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Li, Nanxi
Raval, Manan
Poulton, Christopher V.
Ruocco, Alfonso
Singh, Neetesh
Vermeulen, Diedrik
Ippen, Erich P.
Kolodziejski, Leslie A.
Watts, Michael R.

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Many optical systems require broadband filters with sharp roll-offs for efficiently splitting or combining light across wide spectra. While free space dichroic filters can provide broadband selectivity, on-chip integration of these high-performance filters is crucial for the scalability of photonic applications in multi-octave interferometry, spectroscopy, and wideband wavelength-division multiplexing. Here we present the theory, design, and experimental characterization of integrated, transmissive, 1 x 2 port dichroic filters using spectrally selective waveguides. Mode evolution through adiabatic transitions in the demonstrated filters allows for single cutoff and flat-top responses with low insertion losses and octave-wide simulated bandwidths. Filters with cutoffs around 1550 and 2100 nm are fabricated on a silicon-on-insulator platform with standard complementary metal-oxide-semiconductor processes. A filter roll-off of 2.82 dB nm(-1) is achieved while maintaining ultra-broadband operation. This new class of nanophotonic dichroic filters can lead to new paradigms in on-chip communications, sensing, imaging, optical synthesis, and display applications.

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Nature Publishing Group (NPG)

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Multidisciplinary sciences

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Nature Communications

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10.1038/s41467-018-05287-1

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