發送短信 : Effect of the second ring of antiresonant tubes in negative-curvature fibers

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 /_____// | || | || |  __ \\    / _ \\   /_   _// 
 `____ `  | || | || | |  \ ||  | / \ ||    | ||   
 /___//   | \\_/ || | |__/ ||  | \_/ ||   _| ||   
 `__ `     \____//  |_____//    \___//   /__//    
 /_//       `---`    -----`     `---`    `--`     
 `-`