title: Optofluidic 1x4 switch.
abstract: An optofluidic 1x4 switch is designed, fabricated, and tested. The switch is based on a blazed diffraction grating imprinted onto silicone elastomer at the bottom of a microfluidic channel that is filled with liquids with different refractive indices. When the condition of a diffraction maximum is met, the laser beam incident on the grating is deflected by an angle proportional to the refractive index mismatch between the elastomer and the liquid in the channel. The switch was tested using four different aqueous salt solutions generating 0(th) to 3(rd) orders of diffraction. The insertion loss was <2.5dB, the extinction ratio was >9.8dB, and the response time was 55 ms. The same basic design can be used to build optofluidic switches with more than 4 outputs.
authors.affiliation: Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0374, USA. agroisman@ucsd.edu
authors.forename: Alex
authors.initials: A
authors.lastname: Groisman
authors.forename: Steve
authors.initials: S
authors.lastname: Zamek
authors.forename: Kyle
authors.initials: K
authors.lastname: Campbell
authors.forename: Lin
authors.initials: L
authors.lastname: Pang
authors.forename: Uriel
authors.initials: U
authors.lastname: Levy
authors.forename: Yeshaiahu
authors.initials: Y
authors.lastname: Fainman
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D044085:Microfluidics / Q000295:instrumentation*; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*