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| || | ||   / _ \\  | \  / ||   / _ \\   /_   _// 
| '--' ||  / //\ \\ |  \/  ||  / //\ \\  `-| |,-  
| .--. || |  ___  ||| .  . || |  ___  ||   | ||   
|_|| |_|| |_||  |_|||_|\/|_|| |_||  |_||   |_||   
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Text this: A nano-ring resonator based on 2-D hexagonal-lattice photonic crystals