Thinnest Optical Waveguide - 2 (IMAGE) University of California - San Diego Caption SEM image of the waveguide structure: a suspended tungsten disulfide monoloayer patterned with nanosized holes. Credit Cubukcu lab Usage Restrictions Please credit: Cubukcu lab 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.