Micrograph of a Human Hair (IMAGE) Optica Caption This is a scanning electron micrograph of a human hair etched by irradiation with an ArF excimer laser; the notches are 50 m wide. Credit IBM Research Usage Restrictions Must include caption & 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.