Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

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

Yale researchersí technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Ultrathin, flat lens resolves chirality and color: Multifunctional lens could replace bulky, expensive machines June 25th, 2016

Imaging

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Ultrathin, flat lens resolves chirality and color: Multifunctional lens could replace bulky, expensive machines June 25th, 2016

Chemistry

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Thin films

Novel capping strategy improves stability of perovskite nanocrystals: Study addresses instability issues with organometal-halide perovskites, a promising class of materials for solar cells, LEDs, and other applications June 13th, 2016

New nanomaterial offers promise in bendable, wearable electronic devices: Electroplated polymer makes transparent, highly conductive, ultrathin film June 13th, 2016

Perovskite solar cells surpass 20 percent efficiency: EPFL researchers are pushing the limits of perovskite solar cell performance by exploring the best way to grow these crystals June 13th, 2016

NRL develops new low-defect method to nitrogen dope graphene resulting in tunable bandstructure June 6th, 2016

Possible Futures

Yale researchersí technology turns wasted heat into power June 27th, 2016

Superheroes are real: Ultrasensitive nonlinear metamaterials for data transfer June 25th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Sensors

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

Artificial synapse rivals biological ones in energy consumption June 21st, 2016

A new form of hybrid photodetectors with quantum dots and graphene June 19th, 2016

Drum beats from a one atom thick graphite membrane June 15th, 2016

Announcements

Yale researchersí technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

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







Car Brands
Buy website traffic