Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Sculptured materials allow multiple channel plasmonic sensors

Akhlesh Lakhtakia
Akhlesh Lakhtakia

Abstract:
Sensors, communications devices and imaging equipment that use a prism and a special form of light -- a surface plasmon-polariton -- may incorporate multiple channels or redundant applications if manufacturers use sculptured thin films.

Sculptured materials allow multiple channel plasmonic sensors

University Park, PA | Posted on November 11th, 2009

"Everyone uses surface plasmon resonance sensors. They are a multi billion-dollar industry worldwide," said Akhlesh Lakhtakia, the Charles Godfrey Binder (Endowed) professor of engineering science and mechanics, Penn State. "This type of sensor provides a fairly quick way to see what you have. It can tell you the concentration of chemicals, but in order to test for more than one chemical today, manufacturers have to use more than one sensor."

Surface plasmon resonance devices currently have a wide range of applications. They are commercially used as sensors for humidity, temperature, chemical concentrations and chemical composition. SPR devices can be used in a form of surface microscopy, as wave guides and tunable filters. Creating two or more channels in each device would multiply SPR utility in all areas of application.

Surface plasmon-polaritons are electromagnetic waves that flow along a sandwich of a metal and a dielectric. When light shines through a prism onto the sandwich, electrons form a cloud or plasma in the metal and the molecules of the dielectric get stretched or polarized. Under special conditions, a plasmon-polariton combination forms and moves as a single unit along the sandwich. The formation can be disturbed by the presence of an additional chemical in the dielectric. The disturbance provides the sensing principle. Useful as they are, each sensor can only detect one chemical for each prism and sandwich.

In a series of papers Lakhtakia and his colleagues report on their theoretical and experimental investigation into the possibility of propagating more than one surface plasmon-polariton wave of the same color on a substrate. They recently reported on their experimental work in the Journal of Nanophotonics and the journal Electonic Letters.

The theoretical work indicated that for one wavelength or color of light, it should be possible to generate not just one, but up to three possible plasmon-polaritons if the dielectric used is not a traditional material, but a periodically non-homogeneous sculptured nematic thin film.

"Just because the mathematics suggest three possible surface plasmon-polariton waves does not mean that they can actually all be created," said Lakhtakia. "We had to find someone who could produce the thin films that we needed to test the possibilities experimentally."

Yi-Jun Jen, professor and chair, and Chia-Feng Lin, graduate student, both of the department of electro-optical engineering, National Taipei University of Technology, fabricated the sculptured nematic thin films that were then used in a standard Kretschmann surface plasma resonance sensor configuration. The researchers found that they produced three surface plasmon-polariton waves of light with the same wavelength or color, but with three different speeds. Two of these were polarized in one direction -- p polarized -- and the third was polarized in the other direction - s polarized.

"This would allow us to test more than two things or to test for the same thing twice in order to reduce sensing errors," said Lakhtakia.

The key to this finding is that sculptured thin films are not the same structure along their thickness. Instead, the pattern of sculpturing does periodically repeat. This periodicity allows the production of two or more surface waves of the same wavelength.

Lakhtakia, working with Devender, an international undergraduate research intern and Drew Patrick Pulsifer, graduated student in engineering science and mechanics, next tried a chiral sculptured thin film. Chiral thin films are similar to periodic sculptured nematic thin films but are like a multitude of parallel corkscrews. Using these thin films the researchers generated two surface plasmon-polaritons waves, but with different speeds, both with p-polarized light.

"If this approach can be optimized and commercialized, there are exciting prospects in store for plasmonic-based sensing, imaging and communications," said Lakhtakia.

####

About Penn State
Penn State is a multicampus public research university that educates students from Pennsylvania, the nation and the world, and improves the well being and health of individuals and communities through integrated programs of teaching, research, and service.

Our instructional mission includes undergraduate, graduate, professional, and continuing education offered through both resident instruction and online delivery. Our educational programs are enriched by the cutting edge knowledge, diversity, and creativity of our faculty, students, and staff.

Our research, scholarship, and creative activity promote human and economic development, global understanding, and progress in professional practice through the expansion of knowledge and its applications in the natural and applied sciences, social sciences, arts, humanities, and the professions.

As Pennsylvania's land-grant university, we provide unparalleled access and public service to support the citizens of the Commonwealth. We engage in collaborative activities with industrial, educational, and agricultural partners here and abroad to generate, disseminate, integrate, and apply knowledge that is valuable to society.

For more information, please click here

Contacts:
Andrea Messer
814-865-9481
live.psu.edu

Copyright © Penn State

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

Recruiting bacteria to be technology innovation partners: September 17th, 2014

Nanoscience makes your wine better September 17th, 2014

Nanoribbon film keeps glass ice-free: Rice University lab refines deicing film that allows radio frequencies to pass September 16th, 2014

Effective Nanotechnology Innovations to Receive Mustafa Prize September 16th, 2014

Imaging

Advanced Light Source Sets Microscopy Record| Berkeley Lab Researchers Achieve Highest Resolution Ever with X-ray Microscopy September 11th, 2014

Researchers Create World’s Largest DNA Origami September 11th, 2014

Development of Algorithm for Accurate Calculation of Average Distance Travelled by Low-Speed Electrons without Energy Loss that Are Sensitive to Surface Structure September 11th, 2014

How skin falls apart: The pathology of autoimmune skin disease is revealed at the nanoscale September 10th, 2014

DELMIC and Phenom-World announce Delphi, the world’s first fully integrated tabletop fluorescence and electron microscope September 8th, 2014

Chemistry

Development of Algorithm for Accurate Calculation of Average Distance Travelled by Low-Speed Electrons without Energy Loss that Are Sensitive to Surface Structure September 11th, 2014

Iranian, Spanish Scientists Produce Recyclable Catalyst by Using Nanoparticles September 3rd, 2014

Production of Toxic Ion Nanosorbents with High Sorption Capacity in Iran August 17th, 2014

Thin films

Beneq launches nFOG™ wet coating technology September 3rd, 2014

Picosun joins forces with IMEC for novel, industrial ALD applications August 25th, 2014

Possible Futures

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Sensors

Nanoscience makes your wine better September 17th, 2014

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

First Colloid and Polymer Science Lecture awarded to Orlin D. Velev: Chemical engineer honored for outstanding research in colloid science September 12th, 2014

UT Arlington research uses nanotechnology to help cool electrons with no external sources September 11th, 2014

Announcements

Nanoscience makes your wine better September 17th, 2014

Carbon Sciences Developing Breakthrough Technology to Mass-Produce Graphene -- the New Miracle Material: Company Enters Into an Agreement With the University of California, Santa Barbara (UCSB) to Fund the Further Development of a New Graphene Process September 16th, 2014

Nanoribbon film keeps glass ice-free: Rice University lab refines deicing film that allows radio frequencies to pass September 16th, 2014

Effective Nanotechnology Innovations to Receive Mustafa Prize September 16th, 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