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Published February 20, 2019 | Supplemental Material
Journal Article Open

High Spectral Resolution Plasmonic Color Filters with Subwavelength Dimensions


Rapid advances in image sensor technology have generated a mismatch between the small size of image sensor pixels and the achievable filter spectral resolution. This mismatch has prevented the realization of chip-based image sensors with simultaneously high spatial and spectral resolution. We report here a concept that overcomes this trade-off, enabling high spectral resolution (transmission FWHM <31 nm) filters with subwavelength dimensions operating at optical and near-infrared wavelengths. An inverse design methodology was used to realize a new type of plasmonic cavity that efficiently couples an in-plane Fabry–Perot resonator to a single plasmonic slit that supports surface plasmon polaritons. This design principle, combined with a new metal imprinting method that yields metallic nanostructures with both top and bottom surfaces that are extremely smooth, enabled demonstration of high spectral resolution transmission filters with smaller area than any previously reported.

Additional Information

© 2019 American Chemical Society. Received: November 26, 2018; Published: January 2, 2019. This work was supported by the Air Force Office of Scientific Research under grant number FA9550-16-1-0019. G.T. acknowledges support from the Swiss National Science Foundation through the Advanced Mobility Fellowship, Grant P300P2_171417. D.F. gratefully acknowledges Artur Davoyan, Matt Sullivan Hunt, Michelle Sherrott, Phil Jahelka, and Sisir Yalamanchili for useful discussions during the development of this work. Author Contributions: D.F. and H.A.A. conceived of the ideas. K.F. formatted the optimization code, built the peak finding algorithm, and designed the FOM with input from D.F. D.F. used the optimization code to identify the filter geometry. D.F. developed the fabrication method and made the filters. G.T. and C.B. built the measurement setup. D.F. and C.B. took the measurements, and G.T. contributed to data analysis. D.F. and H.A.A. cowrote the paper. All authors discussed the results and commented on the manuscript, and H.A.A. supervised. The authors declare no competing financial interest. Notes: The data that support the findings of this study are available from the corresponding author upon reasonable request.

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August 19, 2023
October 19, 2023