Laboratory,;
Department;
of;
Physics,;
Faculty;
of;
Science,;
Kunming;
University;
of;
Science;
and;
Technology,;
Kunming;
650500,;
China;
of;
Mechanical;
and;
Biomedical;
Engineering,;
City;
University;
of;
Hong;
Kong,;
Hong;
Kong,;
China;