Subwavelength-Structure-Assisted Ultracompact Polarization-Handling Components on Silicon

Yu, Zejie; Xu, Hongnan; Liu, Dajian; Li, Huan; Shi, Yaocheng; Dai, Daoxin

doi:10.1109/jlt.2021.3134469

Cited by 15 publications

(5 citation statements)

References 199 publications

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“…Owing to this distinctive attribute of SWGs, the meta-structured PBS has attracted tremendous research interest. [39,40] One straightforward approach is to build an ADC by combining regular waveguides with SWG waveguides, as demonstrated in refs. [41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Meta‐Structured Silicon Nanophotonic Polarization Beam Splitter with an Optical Bandwidth of 415 nm

Qin

et al. 2023

Laser & Photonics Reviews

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The polarization beam splitter (PBS) is a pivotal element in the polarization management of free‐space optical instruments and systems. Photonic integrated circuits for sensing, imaging, communications, and quantum‐information processing also have needs for monolithically integrated PBSs with an ultra‐broad optical bandwidth. In this paper, a novel silicon nanophotonic PBS inspired by the crystalline Glan–Thompson prism but implemented with silicon subwavelength‐grating (SWG) metamaterials is presented. Due to the tailored artificial anisotropy of SWGs, the meta‐prism functions like a thin‐film reflector or a waveguide crossing for different polarizations. Thus, the incident light can be steered with strong polarization selectivity and negligible wavelength dependence. Unlike conventional PBS designs, the routing of polarized light is enabled by the wavelength‐independent total internal reflection in anisotropy‐engineered effective media, thereby breaking the bandwidth limit. The device footprint is as small as ≈15 × 7 µm2. Low insertion losses of 0.6–1.7 dB and high extinction ratios of 20–30 dB are experimentally achieved spanning a record broad bandwidth of over 415 nm, ranging from 1.26 to 1.675 µm wavelength. These results represent, to the best of their knowledge, the most broadband integrated PBS ever demonstrated to date.

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Section: Introductionmentioning

confidence: 99%

Meta‐Structured Silicon Nanophotonic Polarization Beam Splitter with an Optical Bandwidth of 415 nm

Qin

et al. 2023

Laser & Photonics Reviews

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“…However, the large index contrast also leads to a strong birefringence. Therefore, polarization management in SOI becomes of great importance [2]. Different types of devices are employed to fulfill this task.…”

Section: Introductionmentioning

confidence: 99%

High performance TM-pass polarizer via subwavelength grating bandgap engineering

Barona-Ruiz,

Pérez-Armenta,

Ortega-Moñux

et al. 2023

2023 IEEE Silicon Photonics Conference (SiPhotonics)

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Silicon photonics systems exhibit a strong birefringence which makes polarization management critical. Here we demonstrate, with full 3D-FDTD simulations, a TM-pass polarizer based on tilted subwavelength gratings that reflects the TE0 mode into the TE1 mode, which can then be easily eliminated. The polarizer achieves TM mode insertion losses below 0.4dB, reflections into the undesired fundamental TE mode of less than -20 dB, and an extinction ratio above 20 dB, over a 150 nm bandwidth around the wavelength of 1550 nm.

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“…Polarization rotators [ 1 , 2 , 3 , 4 , 5 ] are an essential component in optical fiber communication systems for applications such as the circulator [ 6 , 7 ]. The polarization rotators formed by metasurfaces or metamaterials have also been studied [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…For the integrated optical polarization rotators, asymmetric cross-sections of the waveguide produce the horizontal and vertical polarization modes. The birefringence of the two eigenmodes of the waveguide, which are oriented at 45° with respect to the wafer axis, results in the coupling between two eigenmodes and the polarization rotation [ 1 , 2 , 3 , 4 , 5 ]. In high-power, short-pulse laser systems, high-precision reflective polarization rotators are required to provide a higher accuracy and a higher damage threshold [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Reflective Polarization Rotator in Silicon Waveguide

et al. 2022

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In this work, we investigate theoretically the reflective polarization rotator in a silicon waveguide formed by periodically arranged rectangular air holes. The etched air holes generate the large birefringence for the waveguide. The effective refractive index of the non-etched waveguide is isotropic. The structure can be regarded as a stack of alternating birefringent waveplates and isotropic material similar to the folded Šolc filter. The band structure of the stack of birefringent waveplates with isotropic background is calculated to confirm the fact that high reflection peaks in the reflection spectra of the waveguide result from the photonic bandgap. The polarization extinction ratio for the reflected light is 15.8 dB. The highest reflectivity of the device is 93.1%, and the device length is 9.21 μm. An ultra-wide operation bandwidth from 1450.3 to 1621.8 nm can be achieved.

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Subwavelength-Structure-Assisted Ultracompact Polarization-Handling Components on Silicon

Cited by 15 publications

References 199 publications

Meta‐Structured Silicon Nanophotonic Polarization Beam Splitter with an Optical Bandwidth of 415 nm

Meta‐Structured Silicon Nanophotonic Polarization Beam Splitter with an Optical Bandwidth of 415 nm

High performance TM-pass polarizer via subwavelength grating bandgap engineering

Design of Reflective Polarization Rotator in Silicon Waveguide

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