Submitted on: 15 April 2011.
Revised on: 08 July 2011.
Accepted on: 29 August 2011.
___________________Acta Photonica Sinica---SCIENCE PRESS
Submitted on: 25 June 2018.
Revised on: 12 October 2018.
Accepted on: 09 December 2018.
___________________Acta Photonica Sinica---SCIENCE PRESS
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Submitted on: 21 January 2000.
Revised on: 19 March 2000.
Accepted on: 26 April 2000.
___________________Acta Photonica Sinica---SCIENCE PRESS
Submitted on: 23 January 2014.
Revised on: 14 April 2014.
Accepted on: 23 May 2014.
___________________Acta Photonica Sinica---SCIENCE PRESS
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