Diagram (IMAGE) University of Minnesota Caption One modification researchers made to the device was to use a transparent electrical material called indium tin oxide for the electrode to allow light to pass through it. These layers are stacked into a pillar with a diameter of only 10 μm, which is only one-tenth the diameter of a typical human hair. Credit Junyang Chen, University of Minnesota Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.