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.
1School of Electrical and Electronic Engineering, Nanyang Technological University,Nanyang Avenue, Singapore 639798, Singapore.
J Q
JQ
Yu
Y
Y
Yang
A Q
AQ
Liu
L K
LK
Chin
X M
XM
Zhang
D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D044085:Microfluidics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012996:Solutions / Q000737:chemistry*
D012996:Solutions