Microfluidic droplet grating for reconfigurable optical diffraction.
This Letter presents a reconfigurable optical diffraction grating using multiphase droplets on a microfluidic chip. The uniform and evenly spaced circular droplets are generated by continuously dispersing two immiscible liquids into a T junction to produce plugs, which are then transformed into a circular shape at a sudden expansion of the microchannel. In experiments, the droplet grating shows a detection limit of ~6.3x10(-5) when used as an opto fl uidic refractometer and produces different colors as a color filter. Such a grating has the advantages of high stability and wide tunability in droplet size, grating period, and refractive index, making it promising for biochemical and biomaterial applications.
Yu
J Q
JQ
1School of Electrical and Electronic Engineering, Nanyang Technological University,Nanyang Avenue, Singapore 639798, Singapore.
Yang
Y
Y
Liu
A Q
AQ
Chin
L K
LK
Zhang
X M
XM
D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D044085:Microfluidics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012996:Solutions / Q000737:chemistry*
D012996:Solutions