Abstract
Anisotropic metameterials (AM) provide a new avenue for a next-generation silicon platform to design ultra-compact, densely integrated optical components, thus functional devices based on AM are drawing increasing attention recently. Here, we propose a novel efficient polarization beam splitter (PBS) with high polarization extinction ratio based on AM. An ultra-compact coupling region of 2.5 × 14 µm2 is achieved by tailoring the AM structures, which can efficiently suppress the TE mode coupling, and enhance the TM mode coupling in the directional couplers simultaneously. The insertion loss is simulated to be as low as <0.2 dB within a bandwidth of 70 nm for both modes, and the polarization extinction ratio is as high as 46 dB and 33 dB for TE and TM modes, respectively. We also experimentally demonstrate the proposed PBS, with low insertion loss of 1 dB , high extinction ratio of >20 dB and wide operational bandwidth of >80 nm.
Highlights
Integrated photonic circuits (PIC) are widely used for optical communication, metrology, spectroscopy, quantum computing and communication, thanks to the superior advantages of small device size, low power consumption, and compatibility with the complementary metal–oxide–semiconductor (CMOS) technology [1,2]
We propose an ultra-compact subwavelength-strips-based Anisotropic metameterials (AM) polarization beam splitter with low insertion loss and ultra-high polarization extinction ratio
The S-bend waveguide is a critical part for integrated photonic devices, which will influence the performance of the Polarization beam splitter (PBS) [42,43,44]
Summary
Integrated photonic circuits (PIC) are widely used for optical communication, metrology, spectroscopy, quantum computing and communication, thanks to the superior advantages of small device size, low power consumption, and compatibility with the complementary metal–oxide–semiconductor (CMOS) technology [1,2]. Various types of PBS have been demonstrated, such as directional couplers (DC) [15,16,17], multimode interference (MMI) [18,19,20], and asymmetrical directional couplers (ADC) [15,21], and plasmonic waveguides [22,23] These structures usually suffer from large footprint, narrow bandwidth, low fabrication tolerance, or low polarization extinction ratio. It is known that the all-dielectric metamaterials are able to make anisotropic crystal structures, making possible large refractive index contrast between two orthogonal modes propagating in the waveguides [29] With this property, it is still worthy to explore the PBS utilizing AM to exhibit peculiar optical effects and advantages, including low loss, high polarization extinction ratio, wide bandwidth, and ultra-compact size. When light beam is launched into Input A or Input B, the TE polarized light remains in the same waveguide, while the TM polarized light is coupled to the other waveguide
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