Dual mode operation, highly selective nanohole array-based plasmonic colour filters

Abstract

Taking advantage of nanostructured metal films as plasmonic colour filters (PCFs) has been evolved remarkably as an alternative to the conventional technologies of chemical colour filtering. However, most of the proposed PCFs depict a poor colour purity focusing on generating either the additive or subtractive colours. In this paper, we present dual mode operation PCFs employing an opaque aluminium film patterned with sub-wavelength holes. Subtractive colours like cyan, magenta, and yellow are the results of reflection mode of these filters yielding optical efficiencies as high as 70%-80% and full width at half maximum of the stop-bands up to 40-50 nm. The colour selectivity of the transmission mode for the additive colours is also significant due to their enhanced performance through the utilization of a relatively thick aluminium film in contact with a modified dielectric environment. These filters provide a simple design with one-step lithography in addition to compatibility with the conventional CMOS processes. Moreover, they are polarization insensitive due to their symmetric geometry. A complete palette of pure subtractive and additive colours has been realized with potential applications, such as multispectral imaging, CMOS image sensors, displays, and colour printing.

Numerical Investigation on Multiple Resonant Modes of Double-Layer Plasmonic Grooves for Sensing Application

“…Since the discovery of extraordinary optical transmission through subwavelength aperture arrays on opaque metal films [1], the design of metal nanostructures and analysis of involved physical mechanisms have attracted enormous attention, and these studies have tremendously contributed to the development of surface plasmonic nanophotonics [2][3][4][5][6]. In the past few years, many applications on the basis of surface plasmon nanostructures have been proposed, such as sensors, superlens imaging [7][8][9], negative refractive effects [10][11][12], color filters [13][14][15][16][17], perfect absorbers [18][19][20] and the like. Surface plasmon sensors have developed into an advanced detection method because of their high sensitivity, wide detection range and easy miniaturization.…”

Bidirectional Angle-Tolerant Polarization-Tuned Filtering and Wide-Range Refractive Index Sensing Based on Metal Film Coated Nanograting

“…In recent years, the various plasmonic nanostructures have drawn great attention in applications such as thermal emitters [ 1 ], color filters [ 2 , 3 , 4 ], solar cells [ 5 , 6 ], chemical and biological sensors [ 7 , 8 , 9 ], imaging devices [ 10 , 11 , 12 ], etc. Among these nanostructures, periodic nanogratings are playing a crucial role in this rapidly growing plasmonics research field [ 13 , 14 , 15 ].…”

Short-range ordered 2D nanoholes: lattice-model and novel insight into the impact of coordination geometry and packing on their propagating-mode transmittance features

“…Resonantly enhanced light transmission, leading to extraordinary optical transmission (EOT) phenomena, is a fascinating property exhibited by periodic arrays of sub-wavelength holes, periodically milled in an optically thick (>100 nm) metal lm. 1,2 Since the seminal report on EOT, 1 metal nanohole (NH) distributions have attracted worldwide interest for several applications: for instance, plasmonic solar cells and photodetectors, 3 plasmonic color-lter devices, 4,5 surface enhanced Raman scattering, 6 surface enhanced uorescence spectroscopy, 7,8 monitoring of surface-binding events in chemical and biochemical sensing, [9][10][11] preferably by microuidic-chip based detection due to the benets of a simple optical set-up, dense integration of sensors, multiplexing for parallel and selective analyte sampling in miniaturized and high throughput sensors. 12,13 From the fundamental standpoint, resonant transmission phenomena were rst ascribed to coupling between free-space photons and Bloch-wave surface plasmon polaritons mediated by diffractive hole grating (grating-coupling model).…”