Resonant absorption of a chemically sensitive layer based on waveguide gratings

Laurent Davoine; Vincent Paeder; Guillaume Basset; Marc Schnieper; Hans Peter Herzig

doi:10.1364/AO.52.000340

Applied Optics
Vol. 52,
Issue 3,
pp. 340-349
(2013)
•https://doi.org/10.1364/AO.52.000340

Resonant absorption of a chemically sensitive layer based on waveguide gratings

Laurent Davoine, Vincent Paeder, Guillaume Basset, Marc Schnieper, and Hans Peter Herzig

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Laurent Davoine, Vincent Paeder, Guillaume Basset, Marc Schnieper, and Hans Peter Herzig, "Resonant absorption of a chemically sensitive layer based on waveguide gratings," Appl. Opt. 52, 340-349 (2013)

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Abstract

A colorimetric sensor providing a direct visual indication of chemical contamination was developed. The sensor is a combination of a chemically sensitive dye layer and a resonant waveguide grating. Enhancement of the light absorption by the photonic structure can be clearly seen. The detection is based on the color change of the reflected light after exposure to a gas or a liquid. Low-cost fabrication and compatibility with environments where electricity cannot be used make this device very attractive for applications in hospitals, industries, with explosives, and in traffic.

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Equations (19)

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Parameters	Structure 1	Structure 2
$Λ$ , grating period (nm)	310	320
$t_{g}$ , grating depth (nm)	50	50
$t_{w}$ , waveguide thickness (nm)	24	13
$t_{d}$ , dye thickness (nm)	200	200
$θ$ , incidence angle (°)	20	20
$λ_{r}$ , $r$ Resonant wavelength (nm)	599.0	600.1
$Δ λ$ , resonance bandwidth (nm)	1.25	0.60
$Q$ , Quality factor	479	1000
$n_{eff}$ , effective mode index	1.62	1.55
$k$ (impedance matching conditions)	$1.69 E - 3$	$7.7 E - 4$

Parameters	Optimized Structure
$Λ$ , grating period (nm)	295
$t_{g}$ , grating depth (nm)	70
$t_{w}$ , waveguide thickness (nm)	50
$t_{d}$ , dye thickness (nm)	160
$θ$ , incidence angle (°)	17
$λ_{r}$ , Resonant wavelength (nm)	582

Exposure Time (min)	L	A	b	CIE $x$	CIE $y$	DE
0	100	$- 60.0$	16.1	0.297	0.356	—
1	100	$- 60.0$	11.9	0.293	0.354	4.24
2	100	$- 60.0$	9.7	0.292	0.353	6.42
3	100	$- 60.0$	7.8	0.290	0.351	8.34
4	100	$- 60.0$	6.9	0.289	0.351	9.26

Exposure Time (min)	L	A	b	CIE $x$	CIE $y$	DE
0	100	$- 14.4$	57.0	0.351	0.357	—
1	100	$- 14.6$	56.5	0.351	0.357	0.56
2	100	$- 14.8$	55.0	0.350	0.357	1.98
3	100	$- 15.2$	53.3	0.350	0.356	3.72
4	100	$- 15.4$	51.4	0.349	0.355	5.68

Angle (°)	L	a	b	CIE $x$	CIE $y$	DE
17°	46.5	43.3	$- 40.9$	0.289	0.195	—
$A v \pm 0.5 °$	46.5	43.2	$- 40.8$	0.290	0.196	0.13
$A v \pm 1 °$	46.5	42.9	$- 40.6$	0.290	0.196	0.52
$A v \pm 2 °$	46.5	42.0	$- 40.1$	0.290	0.199	1.55

Angle (°)	L	a	b	CIE $x$	CIE $y$	DE
17°	42.9	41.4	$- 41.9$	0.280	0.187	4.2
$A v \pm 0.5 °$	42.9	41.3	$- 41.8$	0.280	0.188	4.2
$A v \pm 1 °$	42.9	41.0	$- 41.6$	0.280	0.189	4.2
$A v \pm 2 °$	42.9	40.1	$- 41.1$	0.280	0.190	4.2

Abstract

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Tables (6)

Equations (19)

Applied Optics