Highly efficient light extraction and directional emission from diamond color centers using planar Yagi-Uda antennas

Multi-slot optical Yagi-Uda antenna for efficient unidirectional radiation to free space

Plasmonic nanoantennas are key elements in nanophotonics capable of directing radiation or enhancing the transition rate of a quantum emitter. Slot-type magnetic-dipole nanoantennas, which are complementary structures of typical electric-dipole-type antennas, have received little attention, leaving their antenna properties largely unexplored. Here we present a novel magnetic-dipole-fed multi-slot optical Yagi-Uda antenna. By engineering the relative phase of the interacting surface plasmon polaritons between the slot elements, we demonstrate that the optical antenna exhibits highly unidirectio…

平面金属-半导体Yagi-Uda型天线用于可调谐窄线宽量子点发射器

Planar metal-semiconductor Yagi-Uda type antennas for tunable narrow-linewidth quantum dot emitters

本研究实验展示了平面金属-半导体Yagi-Uda型天线，通过金属反射层和引向层提高量子点光提取效率，并支持电调谐和应变调谐，为固态量子光子器件提供可扩展平台。

A scanning planar Yagi-Uda antenna for fluorescence detection

An effective approach to improve the detection efficiency of nanoscale light sources relies on a planar antenna configuration, which beams the emitted light into a narrow cone. Planar antennas operate like optical Yagi-Uda antennas, where reflector and director elements are made of metal films. Here we introduce and investigate, both theoretically and experimentally, a scanning implementation of a planar antenna. Using a small ensemble of molecules contained in fluorescent nanobeads placed in the antenna, we independently address the intensity, the radiation pattern and the decay rate as a fun…

使用改进型八木-宇田纳米等离子体天线控制纳米光子网络中的耦合强度

Controlling the Coupling Strengths in Nanophotonic Networks using Modified Yagi-Uda Nanoplasmonic Antennas

该研究提出用改进型八木-宇田纳米等离子体天线结合III-V族纳米线，构建可灵活调控节点间耦合权重的紧凑型纳米光子网络，可用于实现复杂连接的神经网络。

Functional plasmonic nano-circuits with low insertion and propagation losses

We experimentally demonstrate plasmonic nano-circuits operating as sub-diffraction directional couplers optically excited with high efficiency from free-space using optical Yagi-Uda style antennas at λ= 1550 nm. The optical Yagi-Uda style antennas are designed to feed channel plasmon waveguides with high efficiency (45 % in coupling, 60 % total emission), narrow angular directivity (< 40°) and low insertion loss. SPP gap waveguides exhibit propagation lengths as large as 34 μm with adiabatically tuned confinement, and are integrated with ultra-compact (5 μm x 10 μm), highly dispersive directio…

纳米天线辅助量子点发射进入高折射率平面波导

Nano antenna-assisted quantum dots emission into high-index planar waveguide

本文研究在TiO₂平面波导上利用Yagi-Uda纳米天线实现量子点发射的定向耦合，通过射频尺寸缩放与全数值模拟优化设计，实验验证了天线效应并估算了耦合效率和方向性。

Enhanced emission and light control with tapered plasmonic nanoantennas

We introduce a design of Yagi-Uda plasmonic nanoantennas for enhancing the antenna gain and achieving control over the angular emission of light. We demonstrate that tapering of antenna elements allows to decrease spacing between the antenna elements tenfold also enhancing its emission directivity. We find the optimal tapering angle that provides the maximum directivity enhancement and the minimum end-fire beamwidth.

All-dielectric optical nanoantennas (Review)

We propose a new type of highly efficient Yagi-Uda nanoantenna and introduced a novel concept of superdirective nanoantennas based on silicon nanoparticles. In addition to the electric response, this silicon nanoantennas exhibit very strong magnetic resonances at the nanoscale. Both types of nanoantennas are studied analytically, numerically and experimentally. For superdirective nanoantennas we also predict the effect of the beam steering at the nanoscale characterized by a subwavelength sensitivity of the beam radiation direction to the source position.

Efficient Nano Antenna for Photonic Devices

This paper presents the efficient Yagi-Uda nanoantenna with the chain of directors, reflector and a feed element, where these elements have been optimized to fulfil the requirement of high directivity and the gain of antenna. The proposed design consists of six core and cladding with silver core and silicon cladding is used to achieve high directivity. The design is analyzed by FIT based CST Software package by which Directivity and Gain of the antenna are computed. The enhancement of this directivity is mainly contributed by the increase in the number of directors from the four to five and th…

Optical ultracompact directional antenna based on a dimer nanorod structure

Controlling directionality of optical emitters is of utmost importance for their application in communication and biosensing devices. Metallic nanoantennas have been proven to affect both excitation and emission properties of nearby emitters, including directionality of their emission. In this regard, optical directional nanoantennas based on a Yagi-Uda design have been demonstrated in the visible range. Despite this impressive proof of concept, their overall size and considerable number of elements represent obstacles for the exploitation of these antennas in nanophotonic applications and for…