Index

JH Group

Electronic/Spintronic/Photonic MetaMaterials

Overview

We define a metamaterial as a material wherein structure and composition are controlled at length scales comparable to the underlying physical phenomena. Our group is dedicated to developing and understanding metamaterials for electronic, spintronic, and photonic applications. For example, one research thrust focuses on overcoming lithographic limits on top-down patterning to form highly ordered arrays of nanoscale magnetic devices at densities of 10¹¹ cm^-2 (0.5 TBit/in²). A second thrust exploits the epitaxial control of bottom-up synthesis in the growth of low-dimensional quantum structures with novel topologies and composition via pulsed laser deposition (PLD) and metal-organic chemical vapor deposition (MOCVD). A third effort borrows from the success of inorganic synthetic chemistry to study the behavior of spin-transport in molecular tunnel junctions (MTJs) in order to identify appropriate molecular materials for active nanoscale molecular electronic devices.

All of these activities are supported by our test and measurement facilities, including electronic measurement from DC to 30 GHz in conjunction with ultrafast pump-probe spectroscopy from 325 nm to 1600 nm, allowing for integrated electro-optic measurements from room temperature to 1.5 K and from zero field to 8 Tesla.

For more detailed information on our research and our group, please follow the links to the left.

Archive

Group News

Group Contact

E. Johnston-Halperin

Department of Physics

191 W. Woodruff Ave.

Columbus OH, 4321

O:(614)247-4074

L:(614)247-7367

Laboratory

Group Meeting

To see a higher resolution image, click on the image.

Polarization dependence photoluminescence study of InP nanowires. (a) SEM image of as grown InP nanowire (b) SEM image of Ta₂O₅ coated InP nanowire (c) Typical polarization dependent photoluminescence of as grown nanowire, when the pump polarization is parallel (black) and perpendicular (red) to the collection polarization. (d) Dependence of photoluminescence intensity on polarization angle between pump and collection path. As grown sample shows strong polarization dependence (red star), which is significantly attenuated by coating with Ta₂O₅(black triangle).