Diffraction grating-based encoded particle

Illustration of refractive index profile for single grating with a period of 1 micron

T

-i 1 T—' 1—' *t 1 1 r

2 4 6 8 10 12 14 16 longitudinal position location on grating (micron)

Illustration (a)

lllustration of refractive index profile for 3 colocated gratings whose period vary by 0.3%

2 4 6 8 10 12 14 16 longitudinal position location on grating (micron)

FIG. 10

grating 1

grating 2

■grating 3

Illustration (c)

92. 0.002 0.0018 g 0.0016 •E 0.0014

CD

I 0.0012

•fc 0.001

.E 0.0008

§> 0.0006

o 0.0004

0.0002 94

Illustration of refractive index profile for 3 colocated
gratings whose period vary by 3%

0.007

Illustration (b)

Index modulation caused by superposition of 3 gratings where the pitch between each grating varies by 3%.

0 2 4

FIG. 10

6 8 10 12 14 16 18 20 Illustration (d)