Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas<xref rid="cpb_27_9_094217fn1" ref-type="fn">*</xref><fn id="cpb_27_9_094217fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0205700 and 2015CB932403) and the National Natural Science Foundation of China (Grant Nos. 11174062, 51472057, and 21790364).</p></fn>

Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas**

Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0205700 and 2015CB932403) and the National Natural Science Foundation of China (Grant Nos. 11174062, 51472057, and 21790364).

Tan Jingfeng^†, Pang Hua, Meng Fengkai, Jiang Jin

(color online) (a) Scattering efficiency (defined as ratio of the two-dimensional scattering cross section, which has the dimension of length and geometric length L) of two isolated square Si antennas with side lengths of L₁ = 600 nm and L₂ = 400 nm. The inset shows the schematic of a Si nanoantenna excited by a TM plane wave. (b) Scattered y component of the magnetic fields of ED resonance at L₂ at the wavelength of 1360 nm and MQ resonance at L₁ at the wavelength of 1460 nm. (c) Transmission to one end of the waveguide for individual L₁ and L₂ excited by a Gaussian beam focused to a 3 μm spot. (d) Relative phase difference between the waveguide modes coupled by the two nanoantennas.