Spontaneous emission enhancement and directional emission by an optical nanonatenna array on a metallic mirror
نویسندگان
چکیده
Optical nanoantennas support surface plasmon polariton (SPP) with a confinement of light breaking through the diffraction limit, and thereby achieving an enhancement regulation electromagnetic field on deep-subwavelength scale. In this paper, periodic array optical metallic mirror is proposed, where antennas are gold nanocubes forming two-dimensional array, single point emission source located in nanogap between antenna nanocube mirror. The can gap plasmon, which results enhanced spontaneous rate. Meanwhile, lattice resonance (SLR), achieve directional far-field radiation perpendicular to substrate or specified direction by properly designing period. To design that simultaneously rate far field, calculation structure transformed into fields set pseudoperiodic point-source arrays combining scanning method (ASM) full-wave rigorous numerical method, thus giving emitter near-field distribution antenna. Concerning angular intensity, we start from Maxwell’s equations provide formulation proof reciprocity-theorem method. This different those reported existing literature has more applicability for infinite-extent structures lower amount computational work. Based parameters designed so factor intensity reaches maximum value 2756 substrate, simultaneously, factors total reach 1097 55.50, respectively. proposed simple easy fabricate, intuitive implement, be used guide high-speed, high-brightness directional-radiation sources.
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ژورنال
عنوان ژورنال: Chinese Physics
سال: 2023
ISSN: ['1000-3290']
DOI: https://doi.org/10.7498/aps.72.20222007