Navigation Links
Stevens researchers pioneer novel technique to make plasmonic nanogap arrays
Date:9/6/2011

In the quest to exploit unique properties at the nanoscale, scientists at Stevens Institute of Technology have developed a novel technique for creating uniform arrays of metallic nanostructures. A team of faculty and students in the Department of Physics and Engineering Physics, led by Dr. Stefan Strauf, appropriated methods from holographic lithography to demonstrate a new approach for scaling up the fabrication of plasmonic nanogap arrays while simultaneously reducing costs and infrastructure. A paper on the technique recently appeared in Nano Letters 11, 2715 (2011).

"Prof. Strauf is doing research at the forefront of physics," says Dr. Rainer Martini, Department Director for Physics and Engineering Physics. "His lab is producing research breakthroughs with impact well beyond his own field as well as providing excellent learning and publishing opportunities for graduate and undergraduate students."

Plasmonic nanogap arrays are essentially uniformly placed metallic nanostructures which feature a tiny air gap between neighbors. By creating strongly confined electrical fields under optical illumination, these tiny air gaps allow scientists to use the arrays in a variety of applications, particularly in the miniaturization of photonic circuits and ultrasensitive sensing. Such sensors could be used to detect the presence of specific proteins or chemicals down to the level of single molecules, or employed in high-resolution microscopy. Nanophotonic circuits, able to transmit huge amounts of information, are considered crucial to bring about the exaflop processing era and a new generation in computing power.

Established fabrication techniques for nanogap arrays have focused on serial methods, which are time-consuming, have a low throughput, and are consequently expensive. Holographic lithography (HL), an optical approach that takes advantage of interference patterns of laser beams to create periodic patterns, had been previously demonstrated to create sub wavelength features. Dr. Strauf's team advanced the HL methodology by using four-beam interference and the concept of a compound lattice to create tunable twin motive shapes into a polymer template, resulting in metallic air gaps down to 7 nm, seventy times smaller than the wavelengths of the blue laser light utilized to write the features.

The Stevens scientists extended the utility of HL to create gaps with results comparable to laborious serial fabrication techniques such as electron beam lithography or focused ion beam milling. Besides being a simpler and more cost-effective production method, their technique does not require a clean room and currently achieves 90% uniformity in the array pattern. Therefore, these innovations provide the foundation for making high-quality, large-scale arrays at a greater speed and lower cost than previously realizable.

"This research project provided me with an opportunity to become an expert with the HL technique," says Xi Zhang, the first author of the Nano Letters article and a PhD candidate. Xi and her fellow students are now measuring the surface enhanced Raman scattering (SERS) effects that result from these arrays and continue to improve the uniformity of the arrays during fabrication. "We just got some excellent results from first SERS experiment, and certainly there are more papers to follow up," she says.

Dr. Strauf is Director of the NanoPhotonics Laboratory (NPL) at Stevens, where he oversees cutting-edge research in the fields of solid-state nanophotonics and nanoelectronics. Research at the lab includes the development of fabrication methods for nanoscale materials and quantum device applications. Recent NPL projects have resulted in papers published on quantum dots and graphene. The lab has received project funding from the Air Force Office of Scientific Research and two National Science Foundation instrumentation grants. Dr. Strauf is also the recipient of the prestigious NSF CAREER Award.


'/>"/>

Contact: Christine del Rosario
cdelrosa@stevens.edu
Stevens Institute of Technology
Source:Eurekalert

Related biology technology :

1. Ash Stevens Plans $6 Million Facility Expansion to Bolster CMC Capabilities
2. Stevens team places third in 2010 IEEE/NIST Mobile Microrobotics Challenge
3. Stevens hosts 2010 metro area NEMS/MEMS Workshop
4. Xiaoguang Meng receives honorary master of engineering from Stevens
5. Microfluidic devices advance 3-D tissue engineering at Stevens
6. Nanoimprint lithography NSF grant awarded to micro device lab at Stevens
7. Dr. Stefan Strauf of physics at Stevens receives NSF CAREER Award for quantum research
8. Dr. Frank Fisher of Stevens selected for Fulbright specialist roster
9. ONR funds study of nanoscale wetting dynamics of superhydrophobic surfaces at Stevens
10. Understanding the science of solar-based energy: more researchers are better than one
11. Researchers decode viral process that prepares cells for HIV infection
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/29/2016)... TURIN, Italy , April 29, 2016 ... version 5.11, the latest update to its industry-leading treatment ... has shown that Monaco version ... Users can now attain calculation speeds up to four ... Monaco . With the industry,s gold standard ...
(Date:4/28/2016)... ... April 28, 2016 , ... Connecticut Innovations (CI), ... today announced the launch of VentureClash , a $5 million global investment ... “VentureClash looks to attract the best early-stage companies here in Connecticut, around the ...
(Date:4/28/2016)... Connecticut (PRWEB) , ... April 28, 2016 , ... ... Group, Inc., will hold an open house for regional manufacturers at its Maple ... displays from Tsugami, Okuma, Hardinge Group, Chiron and Trumpf. Almost 20 leading ...
(Date:4/27/2016)... ... 2016 , ... The Pittcon Organizing Committee is pleased to announce that Charles ... member of Committee since 1987. Since then, he has served in a number of ... chairman for both the program and exposition committees. In his professional career, Dr. Gardner ...
Breaking Biology Technology:
(Date:4/28/2016)... First quarter 2016:   , Revenues amounted ... quarter of 2015 The gross margin was 49% (27) ... the operating margin was 40% (-13) Earnings per share ... operations was SEK 249.9 M (21.2) , Outlook   ... M. The operating margin for 2016 is estimated to ...
(Date:4/15/2016)... , April 15, 2016  A new partnership ... more accurate underwriting decisions in a fraction of ... competitively priced and high-value life insurance policies to ... With Force Diagnostics, rapid testing (A1C, ... data readings (blood pressure, weight, pulse, BMI, and ...
(Date:3/31/2016)... RATON, Florida , March 31, 2016 ... LEGX ) ("LegacyXChange" or the "Company") ... for potential users of its soon to be launched ... video ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also provide ... the use of DNA technology to an industry that ...
Breaking Biology News(10 mins):