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) Transmission spectra of a wavelength demultiplexing coupler in near-infrared with parameters: L₁ = 300 nm, L₂ = 200 nm, d = 700 nm, h = 120 nm, and h₁ = 310 nm, Gaussian beam focused to a 2-μm diameter spot. (b) Transmission spectra in mid-infrared with parameters: L₁ = 1200 nm, L₂ = 820 nm, d = 2610 nm, h = 500 nm, and h₁ = 1230 nm, Gaussian beam focused to a 6-μm diameter spot.