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A cyanine dye, 2-[7-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3,5-heptatrienyl]-1,3,3-trimethy1-3H-indolium iodide (NK-125), is doped in 4-cyano-4-pentylbiphenyl (5 CB), and the mixture is sandwiched between two pieces of rubbed glass plates.