Transmissive silicon photonic dichroic filters with spectrally selective waveguides

Emir Salih Magden (), Nanxi Li, Manan Raval, Christopher V. Poulton, Alfonso Ruocco, Neetesh Singh, Diedrik Vermeulen, Erich P. Ippen, Leslie A. Kolodziejski and Michael R. Watts
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Emir Salih Magden: Massachusetts Institute of Technology
Nanxi Li: Massachusetts Institute of Technology
Manan Raval: Massachusetts Institute of Technology
Christopher V. Poulton: Massachusetts Institute of Technology
Alfonso Ruocco: Massachusetts Institute of Technology
Neetesh Singh: Massachusetts Institute of Technology
Diedrik Vermeulen: Massachusetts Institute of Technology
Erich P. Ippen: Massachusetts Institute of Technology
Leslie A. Kolodziejski: Massachusetts Institute of Technology
Michael R. Watts: Massachusetts Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract 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 × 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.

Date: 2018
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DOI: 10.1038/s41467-018-05287-1

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