Plasmonic nanoresonators for high-resolution colour filtering and spectral imaging

Abstract

Colour and spectral imaging systems typically use fi lters and glass prisms to disperse light of different wavelengths. With the miniaturization of integrated devices, current research on imaging sensors focuses on novel designs aiming at high effi ciency, low power consumption and slim dimension, which poses great challenges to the traditional colourant-based fi ltering and prismbased spectral splitting techniques. In this context, surface plasmon-based nanostructures are attractive due to their small dimensions and the ability to effi ciently manipulate light. In this article we use selective conversion between free-space waves and spatially confi ned modes in plasmonic nanoresonators formed by subwavelength metal -insulator -metal stack arrays to show that the transmission spectra through such arrays can be well controlled by using simple design rules, and high-effi ciency colour fi lters capable of transmitting arbitrary colours can be achieved. These artifi cial nanostructures provide an approach for high spatial resolution colour fi ltering and spectral imaging with extremely compact device architectures.

Design and Fabrication of a Narrow Bandpass Filter with Low Dependence on Angle of Incidence

“…For example, the angle-insensitivity of a silver cross-shaped nanohole array can be maintained up to 35 • for both polarizations in the near-infrared region, but the transmittance of the passband is less than 50% [10]. In a previous work, a one-dimensional grating structure has been used as a wide-angle bandpass filter but only for one polarization [11]. Although extensive efforts are being made to generate structural colors in an angle-independent manner, an angle-independent filter with high transmission and a passband with a narrow bandwidth is still sought.…”

Plasmonic Color-Graded Nanosystems with Achromatic Subwavelength Architectures for Light Filtering and Advanced SERS Detection

“…Nanophotonic devices featuring a spatially-graded, rather than homogeneous, plasmonic response extend such a colour-tailoring concept in a simple, yet extremely appealing, manner. These so-called colour-graded plasmonic systems, based on various physical effects and realized by exploiting a number of nanoarchitectures, have indeed recently found exciting new applications in holography, spectral imaging and colour sorting, and are becoming an increasingly widespread tool in photonics [8][9][10][11][12][13][14][15][16][17][18][19] .…”

High Chromaticity Aluminum Plasmonic Pixels for Active Liquid Crystal Displays

“…In particular, aluminum in nanostructured form has received much recent attention for several reasons: its plasmon resonance is tunable across the entire visible wavelength range, it is an inherently low-cost, sustainable material, and it is compatible with complementary metal-oxide semiconductor (CMOS) manufacturing techniques. 15,17 These factors make aluminum particularly attractive for large-area technological applications, including solar cells, 18,19 filters for color imaging, [20][21][22][23][24] photodetectors, 25 solid-state lighting components, 26 and flat-panel displays. 27,28 To construct plasmonic color devices, nanostructures are typically grouped into micron-scale arrays known as pixels.…”