As {HEAD ~ the element size} that can cause efficient oscillation, a length L of {TAIL ~ one side} is 20 to 200 nm, and typically 40 to 100 nm 
As { HEAD ~ the element size } that can cause efficient oscillation , a length L of { TAIL ~ one side } is 20 to 200 nm , and typically 40 to 100 nm
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH