Event Information:
Topic: Atomic-scale Modeling of Nanoelectronic Devices With Atomistix ToolKit
Date: May 28th, 2013
Time: 11:00 am – 12:00 pm EDT.

Presenters:
Dr. Anders Blom, QuantumWise

The NNIN at the University of Michigan will be hosting a presentation from on “Guidelines for Commercial Photomask Ordering.”

Presenter: Amar S. Basu, Assistant Professor, Department Of Electrical and Computer Engineering, Wayne State University.

FRIDAY NOVEMBER 30th 2012, 3:00-4:00 pm, 1005 EECS

One Day MEMS Workshop – May 22nd, 2012
10:00 am – 4:00 pm
Win 1-2, 3358 AC,
Duderstadt Center,
University of Michigan – Ann Arbor.

As an alternative to grating coupling, the use of plasmonic based resonators and antennas was explored to obtain greater angle independence. This project implements vertical plasmonic resonator arrays with specially designed periodicity to avoid angle variation which were used to increase the scattering efficiency to viewers’ eyes and generate more vivid colours. The design proposed here utilizes light funneling into nanoslits which are exploited to demonstrate near perfect absorption, as large as 96%, in the visible spectrum with plasmonic mode coupling comparable to that of grating coupling. Additionally, wide colour tunability throughout the entire visible spectrum and pixel size beyond the diffraction limit (~λ/2) are demonstrated. A design principle for angle-robust reflection by investigation of angular response of the reflection spectra with respect to the periodicity of arrayed one-dimensional structures is suggested. The ultra-high resolution, widely tunable colour filtering is achieved through adjusting the dimensions of the groove depth. The grooves can be adjusted to provide the colors of yellow, cyan, and magenta by altering only the depth of the groove or the width of the groove while keeping the period and the other dimension constant, which provides the wide color tunability. An example of the visual performance of this technique is show in figure 1 to the right, where this method was employed to create Olympic rings of varying colour with figures inside, through varying the width of the grooves only. This shows the ultra-high resolution possible as well as an example of the color tunability of the device. The angular dependence of these images was measured only up to 30 degree because of the small size of the structure and the limitation of the optical path in the microscope. Within this range, the color appears unchanged. This is an example of the type of performance possible from this approach, which has multiple practical applications. To read more on this exciting research being conducted at the Lurie Nanofabrication Lab at the University of Michigan, visit the link below to view the full article.

Figure 1: Colour demonstrations with ultra-high
resolution and polarization dependent images.

Yi-Kuei Ryan Wu, Andrew E. Hollowell, Cheng Zhang, L. Jay Guo
Work performed in the U Michigan Lurie Nanofabrication Lab

Scientific Reports 3, 1194, 01 February 2013

Full article can be viewed at: http://www.nature.com/srep/2013/130201/srep01194/full/srep01194.html

“The novel mechanism design offers high bearing direction stiffness while maintaining low motion direction stiffness, over a large range of motion direction displacement. The resulting high stiffness ratio mitigates the on-set of sideways snap-in instability, thereby offering significantly greater actuation stroke compared to existing designs.” said Mohammad Olfatnia, a Post-doctoral fellow at the Mechanical Engineering Department.

“Large actuation stroke (larger than 100 µm) with limited foot-print and actuation effort is desirable in a wide range of MEMS applications including optical switches, data-storage systems, high resolution micro printing, endoscopic microscopy, and scanning probe microscopy.” said Shorya Awtar, Assistance Professor of Mechanical Engineering Department.

The electrostatic comb drive actuators fabricated at the Lurie Nanofabrication Facility (LNF) with the new design provide strokes as large as ±245 µm at 120 V and 8 mm² foot-print. In theory, this allows the design of comb-drive actuators such that their stroke is limited simply by the material failure criteria or the available actuation voltage, and not sideways snap-in instability. This research was funded in part by the National Science Foundation.

M. Olfatnia, S. Sood, J.J. Gorman, S. Awtar; University of Michigan
Work performed in the U Michigan Lurie Nanofabrication Lab

M. Olfatnia, S. Sood, J.J. Gorman, S. Awtar; Journal of Microelectromechanical Systems, PP 99 (2012)

“After layoff, training from community college

helps launch older worker into a new field”

Allen completed his Internship for Oakland Community College at the LNF!

Read More