Ma, Changlian <br/><br/>
High-numerical-aperture high-reflectivity focusing reflectors using concentric circular high-contrast gratings.  [electronic resource] 

 -  Applied optics  Feb 2015 
 - 973-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1539-4522 
<br/><br/><label>Standard No.: </label>10.1364/AO.54.000973  doi