1. Laboratory for Photonics and Interfaces (LPI); Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
2. Center of Excellence for Advanced Materials Research (CEAMR); King Abdulaziz University; P. O. Box 80203 Jeddah 21589 Saudi Arabia
3. Chemistry Department, Faculty of Science; King Abdulaziz University; P. O. Box 80203 Jeddah 21589 Saudi Arabia
4. Physics Department, Faculty of Science; King Abdulaziz University; P. O. Box 80203 Jeddah 21589 Saudi Arabia