Nano-aperture vertical cavity surface emitting lasers(VCSELs) with a metal nano-particle were fabricated from common 850 nm VCSELs.When the diameters of the aperture and the metal nanoparitcle were 400 nm and 100 nm respectively,the maximum far field output power reached 0.5 mW at a driving current of 25 mA.The transmission intensity is enhanced by 0.2 mW compared with a single aperture of 400 nm due to enhanced field associated with localized surface plasmon.The enhancement of output power through nano-ape...