Tuesday, February 12, 2013

Panasonic Color Splitter Array Paper

Panasonic Color Splitting Array paper appears in open access on Readcube. The figure below explains the color splitting principle (click on image to enlarge): Figure 1: Operational principle of a symmetric deflector. a, The symmetric deflector has a plate-like structure and is composed of a transparent medium that has a higher refractive index than the surrounding material. When light enters a symmetric deflector of width w and length l, a phase difference δ develops between the light propagated through the deflector and the light propagated through the surrounding volume. If δ is an even multiple of π, the transmitted light is undeflected (arrow U), and if δ is an odd multiple of π, the transmitted light is deflected at equal ± angles (arrows +D and −D). The phase difference δ rises and falls as a function of wavelength λ, so the ratio between the amount of undeflected light and the amount of ± deflected light varies depending on λ. b, Plot of the cross-sectional refractive index distribution for a symmetric deflector. Shape and position of the deflector: w = 0.28 µm, l = 1.20 µm, d = 2.00 µm. Refractive indices of the deflector medium (SiN) and the surrounding medium (SiO2): n = 2.03 and 1.46. c,d, Plots of cross-sectional light intensity distribution for a symmetric deflector with λ = 430 nm (c) and λ = 600 nm (d). The Gaussian beam has a waist diameter D (full width at 1/e2 maximum) of 1.43 µm. As the wavelength increases, deflected light becomes undeflected. e,f, Plots of light intensity distribution at the detector surface for a symmetric deflector for λ = 430 nm (e) and λ = 600 nm (f). Three 1.43 µm × 1.43 µm detectors (R, C and L) are placed next to one another on the detecting surface. As the wavelength increases, the spots on the detector move towards the centre.

1 comment:

1. Is it necessary that light shines vertically inside to get this color separation?

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