Dr. Yap Wing Fen is a Senior Lecturer in The Department of Physics, Faculty of Science, Universiti Putra Malaysia. He is a co-leader in the Applied Optics Laboratory, Department of Physics and also attached to the Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia as a Research Associate. His research interests are optical studies on glasses, ceramics and sensing materials; fundamental studies and the development of optical sensor for various applications based on surface plasmon resonance technique. A patent has been filed in one of his research finding on development of optical sensor for metal ions using surface plasmon resonance spectroscopy. He has also contributed more than 20 articles in international journals and proceeding.