Enhancing the excitation of a high-index nanowire by adding a flat-ended head

Abstract

Abstract A method for enhancing the excitation of a high-index nanowire with an added flat-ended head is numerically investigated. With the assistant of a flat-ended head, the intensity and the power flow of the high-index nanowire illuminated under a plane wave can be both enhanced. Our simulation shows that the enhancement factor is influenced by the length and the refractive index of the nanowire, and the size of the flat-ended head. The enhanced excitation of a silicon nanowire under a near-infrared illumination by an added flat-ended head is studied. Finally, the enhanced excitation affected by the incident angle is discussed.