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We report a novel approach towards realizing a high directionality in the emission of a light-emitting diode (LED) by employing the evanescent wave coupling effect in a small ridge or truncated cone structure. We fabricated an InGaAs/GaAs LED in which a stripe-shaped InGaAs/GaAs quantum well with a stripe width of about 100 nm is embedded at the center of a narrow GaAs ridge (of width 520 nm) by micro...