Transmissive silicon photonic dichroic filters with spectrally selective waveguides
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2018
- Source ID
- 10.1038/s41467-018-05287-1
Entities
People
- Alfonso Ruocco
- Christopher V. Poulton
- Diedrik Vermeulen
- Emir Salih Mağden
- Erich P. Ippen
- Leslie A. Kolodziejski
- Manan Raval
- Michael. R. Watts
- Nanxi Li
- Neetesh Singh