Kavli Affiliate: Harry Atwater
| First 5 Authors: Dagny Fleischman, Luke Sweatlock, Hirotaka Murakami, Harry Atwater,
| Summary:
The subwavelength mode volumes of plasmonic filters are well matched to the
small size of state-of-the-art active pixels (~ 1 {mu}m) in CMOS image sensor
arrays used in portable electronic devices. Typical plasmonic filters exhibit
broad (> 100 nm) transmission bandwidths. Dramatically reducing the peak width
of filter transmission spectra would allow for the realization of CMOS
hyperspectral imaging arrays, which demand the FWHM of transmission peaks to be
less than 30 nm. We find that the design of 5 layer
metal-insulator-metal-insulator-metal structures gives rise to multi-mode
interference phenomena that suppresses spurious transmission features gives
rise to a single narrow transmission band with FWHM as small as 17 nm. The
transmission peaks of these multilayer slot-mode plasmonic filters (MSPFs) can
be systematically varied throughout the visible and near infrared spectrum, so
the same basic structure can serve as a filter over a large range of
wavelengths.
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