Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > CNST Researchers Develop Integrated Nanomechanical Sensor for Atomic Force Microscopy



Scanning electron micrograph of the cantilever-microdisksystem.
The image has a calculated z-component of the magnetic
field overlaid on the structure.
Scanning electron micrograph of the cantilever-microdisksystem. The image has a calculated z-component of the magnetic field overlaid on the structure.

Abstract:
The atomic force microscope (AFM) is an important tool for nanoscale surface metrology. Typical AFMs map local tip-surface interactions by scanning a flexible cantilever probe over a surface. They rely on bulky optical sensing instrumentation to measure the motion of the probe, which limits the sensitivity, stability, and accuracy of the microscope, and precludes the use of probes much smaller than the wavelength of light. As reported in Nano Letters,* CNST researchers have fabricated a novel integrated sensor combining a nanomechanical cantilever probe with a high sensitivity nanophotonic interferometer on a single silicon chip. Replacing the bulky laser detection system allowed them to build cantilevers orders of magnitude smaller than those used in conventional AFMs.

CNST Researchers Develop Integrated Nanomechanical Sensor for Atomic Force Microscopy

Gaithersburg, MD | Posted on June 6th, 2011

Because each of these smaller structures has an effective mass less than a picogram, the detection bandwidth is dramatically increased, reducing the system response time to a few hundred nanoseconds. While probe stiffness was kept comparable to conventional microcantilevers in order to maintain high mechanical gain (how much the tip moves when it senses a force change), the probe size was reduced to a mere 25 µm in length, 260 nm in thickness, and only 65 nm in width. Readout is based on "cavity optomechanics", with the probe fabricated adjacent to a microdisk optical cavity at a gap of less than 100 nm. Due to this close separation, light circulating within the cavity is strongly influenced by the motion of the probe tip. The cavity has a high optical quality factor (Q), meaning that the light makes tens of thousands of round-trips inside the cavity before leaking out of it, all the time accumulating information about the probe's position. The combination of small probe-cavity separation and high Q gives the device sensitivity to probe motion at less than 1 fm/√Hz, while the cavity is able to sense changes in probe position with high bandwidth. The entire device is nanofabricated as a single, monolithic unit on a silicon wafer. It is therefore compact (chip-scale), self-aligned, and stable. Fiber optic waveguides couple light into and out of the sensor, so that it can be easily interfaced with standard optical sources and detectors. Finally, through simple changes to the probe geometry, the mechanics of the probe tip can be greatly varied, allowing for the different combinations of mechanical gain and bandwidth needed for a variety of AFM applications.

*Optomechanical transduction of an integrated silicon cantilever probe using a microdisk resonator, K. Srinivasan, H. Miao, M.T. Rakher, M. Davanco, and V. Aksyuk, Nano Letters 11, 791-797 (2011).

####

About National Institute of Standards and Technology (NIST)
Founded in 1901, NIST is a non-regulatory federal agency within the U.S. Department of Commerce. NIST's mission is to promote U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.

For more information, please click here

Contacts:
Kartik Srinivasan
301-975-5938

Copyright © NIST

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

SUNY Polytechnic Institute Invites the Public to Attend its Popular Statewide 'NANOvember' Series of Outreach and Educational Events October 23rd, 2014

Laboratories

National Synchrotron Light Source II Achieves 'First Light' October 23rd, 2014

Novel Rocket Design Flight Tested: New Rocket Propellant and Motor Design Offers High Performance and Safety October 23rd, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Imaging

National Synchrotron Light Source II Achieves 'First Light' October 23rd, 2014

Govt.-Legislation/Regulation/Funding/Policy

Novel Rocket Design Flight Tested: New Rocket Propellant and Motor Design Offers High Performance and Safety October 23rd, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Brookhaven Lab Launches Computational Science Initiative:Leveraging computational science expertise and investments across the Laboratory to tackle "big data" challenges October 22nd, 2014

Bipolar Disorder Discovery at the Nano Level: Tiny structures found in brain synapses help scientists better understand disorder October 22nd, 2014

Discoveries

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Iranian, Malaysian Scientists Study Nanophotocatalysts for Water Purification October 23rd, 2014

Nanoparticle technology triples the production of biogas October 23rd, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Announcements

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Tools

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

National Synchrotron Light Source II Achieves 'First Light' October 23rd, 2014

Advancing thin film research with nanostructured AZO: Innovnano’s unique and cost-effective AZO sputtering targets for the production of transparent conducting oxides October 23rd, 2014

NIST offers electronics industry 2 ways to snoop on self-organizing molecules October 22nd, 2014

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE