Low-Loss Broadband Silicon TM-Pass Polarizer Based on Periodically Structured Waveguides

Zafar, Humaira; Odeh, Mutasem; Khilo, Anatol; Dahlem, Marcus S.

doi:10.1109/lpt.2020.3011056

Cited by 18 publications

(5 citation statements)

References 19 publications

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“…In previous studies, various on-chip polarization control methods employing grating structures have been investigated. The majority of these methods are designed for the NIR wavelength ranges [28], [42]- [49], [54], with the exception of [50], which is based on periodic structures and operates at a wavelength of 2 µm. Many of these suggested periodic configurations encounter issues with Bragg reflections.…”

Section: Introductionmentioning

confidence: 99%

“…Many of these suggested periodic configurations encounter issues with Bragg reflections. In order to prevent interference with other photonic components and lasers, it is essential to mitigate undesired reflections, which is the focus of efforts in References [28], [46], [47] to minimize their occurrence. In [47], the authors use a multimode waveguide as a Bragg grating, reflecting and converting TE light into higher-order modes, removing them through a tapered transition, reducing reflection loss by about 12 dB.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the grating mentioned in reference [46] reflects TE-polarized light in S, C, and L-bands, and tapered gratings extend operational bandwidth by diffracting TE light in O-band. In [28], the periodicity of the grating structure is manipulated to minimize reflection, effectively placing the undesired TE mode in the high-loss radiation regime instead of the bandgap regime. It was optimized for the L band using a 220 nm-thick silicon layer, resulting in a reflection loss of 13 dB (in the present design, we aim to further reduce reflections by incorporating the periodic waveguide into a directional coupler arrangement).…”

Section: Introductionmentioning

confidence: 99%

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A Novel Mid-Infrared Transverse Magnetic Mode Pass Periodic Waveguide Polarizer With Low Reflections

Zafar,

Pereira

2024

IEEE Access

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We propose a transverse magnetic (TM) pass polarizer based on a periodic waveguide on a silicon-on-insulator platform. The design is implemented on a 500nm-thick silicon layer surrounded by SiO 2 . The polarizer operates in the mid-infrared wavelength range of 3.1 µm to 3.6 µm, a crucial band for chemical and biological sensing, as well as environmental monitoring. While there is extensive documentation on polarizers in the near-infrared (NIR), there is a significant scarcity of research reports on polarizers in the mid-infrared (MIR). This proposed polarizer demonstrates outstanding performance, characterized by ultra-low loss for the transmitted TM mode, minimal reflections of the undesired transverse electric (TE) mode, and exceptionally high loss for the transmitted TE mode. The TM insertion loss remains below 0.5dB over a wavelength range of 3.2 µm to 3.6 µm, as the TM mode operates in the subwavelength and low-loss radiation regimes. The transmitted TE power is remarkably small, falling below -30dB over a 300nm wavelength range. This is attributed to the TE mode operating in the high-loss radiation regime and the bad gap region of the dispersion diagram. Furthermore, the reflected power of the undesired TE mode is significantly reduced (below -20dB) by incorporating the periodic waveguide in a directional coupler setup. The footprint of the polarizer is compact, measuring just 30 µm × 7 µm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Mid-Infrared Transverse Magnetic Mode Pass Periodic Waveguide Polarizer With Low Reflections

Zafar,

Pereira

2024

IEEE Access

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“…SWG is widely employed in various fields including polarization manipulation, with advantages such as board bandwidth and larger fabrication tolerance. [28][29][30][31][32][33][34][35][36][37][38][39] Recently, inverse-designed metamaterial has also been utilized to design on-chip functional components, allowing computers to optimize the structure using various numerical algorithms. This method can optimize the structures extensively with large degrees of design freedom to maximize device performance.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial‐enabled Fully On‐Chip Polarization‐Handling Devices

Zhao,

Xiang,

et al. 2023

Laser & Photonics Reviews

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Polarization manipulation is essential in photonic integrated circuits and has numerous applications in various fields, such as optical communication, nonlinear optics, and quantum optics. Advances in nanofabrication have enabled the integration of subwavelength‐structured metamaterials on optical waveguides, providing unprecedented optical manipulation capabilities beyond classical waveguide‐based architectures. In this paper, the polarization space is demonstrated to be fully manipulated by a dielectric metamaterial composed of nanoholes and nanoslots. This approach offers competitive performances for key polarization components, including the polarizer, polarization beam splitter, and polarization‐splitter‐rotator, while maintaining ultra‐compact coupling regions of 18×1 µm2, 16×1.1 µm2, and 13×1 µm2 respectively. The devices are designed by manipulating the phase and amplitude of all possible eigenmodes supported in the waveguide, which is inherently scalable and versatile for on‐chip mode and wavefront manipulation. The unique properties of metamaterials provide powerful tools for on‐chip polarization manipulation and offer new possibilities for the development of compact and high‐performance photonic integrated circuits.

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“…For TM-pass polarizers several solutions have been proposed, but most of them require a complex fabrication process [5] or reflect the fundamental TE mode back into the system [6], which can have detrimental sideeffects. Other approaches include using a polarization splitting mechanism with an air cladding, which can be problematic for integration [7], employing a Bragg grating with only 50 nm wide slots to radiate the TE polarization [8], or leveraging a directional coupler comprised of silicon and silicon nitride waveguides to couple only the TM mode [9].…”

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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Low-Loss Broadband Silicon TM-Pass Polarizer Based on Periodically Structured Waveguides

Cited by 18 publications

References 19 publications

A Novel Mid-Infrared Transverse Magnetic Mode Pass Periodic Waveguide Polarizer With Low Reflections

A Novel Mid-Infrared Transverse Magnetic Mode Pass Periodic Waveguide Polarizer With Low Reflections

Metamaterial‐enabled Fully On‐Chip Polarization‐Handling Devices

High performance TM-pass polarizer via subwavelength grating bandgap engineering

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