title: Piconewton force measurement using a nanometric photonic crystal diaphragm.
abstract: A compact force fiber sensor capable of measuring forces at the piconewton level is reported. It consists of a miniature Fabry-Perot cavity fabricated at the tip a single-mode fiber, in which the external reflector is a compliant photonic-crystal diaphragm that deflects when subjected to a force. In the laboratory environment, this sensor was able to detect a force of only ∼4  pN generated by the radiation pressure of a laser beam. Its measured minimum detectable force (MDF) at 3 kHz was as weak as 1.3  pN/√Hz. In a quiet environment, the measured noise was ∼16 times lower, and the MDF predicted to be ∼76  fN/√Hz.
authors: Wonuk
authors: W
authors: Jo
authors: Michel J F
authors: MJ
authors: Digonnet
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D008027:Light; D008365:Manometry / Q000295:instrumentation*; D008567:Membranes, Artificial; D008904:Miniaturization; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011312:Pressure; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013314:Stress, Mechanical
chemical_list: D008567:Membranes, Artificial