Integrated polarization rotator/converter by stimulated Raman adiabatic passage

Xiong, X.; Zou, Chang‐Ling; Ren, Xinyi; Guo, Guang‐Can

doi:10.1364/oe.21.017097

Cited by 20 publications

(16 citation statements)

References 38 publications

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“…Since silicon dioxide is used as the top-cladding to enable compatibility with our metal BEOL processes, vertical symmetry could not be broken by using air as top-cladding. Inspired by the work of [14][15][16][17], we use a double-etched waveguide to break the two dimensional symmetry. In addition, we need to make sure that the effective refractive index of the TM 0 mode in the ridge waveguide and that of the TE 0 mode in the double-etched waveguide are close enough to achieve strong cross-polarization coupling.…”

Section: Device Principlementioning

confidence: 99%

CMOS-compatible highly efficient polarization splitter and rotator based on a double-etched directional coupler

Guan¹,

Novack²,

Streshinsky³

et al. 2014

Opt. Express

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We present a highly efficient polarization splitter and rotator (PSR), fabricated using 248 nm deep ultraviolet lithography on a silicon-on-insulator substrate. The PSR is based on a double-etched directional coupler with a length of 27 µm. The fabricated PSR yields a TM-to-TE conversion loss better than 0.5 dB and TE insertion loss better than 0.3 dB, with an ultra-low crosstalk (-20 dB) in the wavelength regime 1540-1570 nm.

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Section: Device Principlementioning

confidence: 99%

CMOS-compatible highly efficient polarization splitter and rotator based on a double-etched directional coupler

Guan¹,

Novack²,

Streshinsky³

et al. 2014

Opt. Express

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“…Then, with the n e f f of eigenmodes, mode propagation during the coupling region can be obtained. Similar to the time evolution of quantum states, the evolution of modes in the waveguide follows Schrödinger equation [21,22], and can be expressed as…”

Section: Discussionmentioning

confidence: 99%

Efficient coupling between dielectric waveguide modes and exterior plasmon whispering gallery modes

Xu¹,

Xiong²,

Zou³

et al. 2013

Opt. Express

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Abstract:Inefficient coupling between dielectric guided mode and plasmon mode has been overlooked in the past. The mechanism in it is essentially different from the conventional coupling between dielectric modes. Based on qualitative theoretical analysis, we proposed two methods to strengthen the coupling between dielectric waveguide modes and exterior plasmon whispering gallery modes. One is using a U-shaped bent waveguide to break the adiabatic mode conversion process, and the other is to render the dielectric mode of higher-order to reach phase matching with plasmon mode. Both the transmission spectrum of waveguide and the energy spectrum of cavity demonstrate that the coupling efficiencies can be greatly improved. These simple configurations are potential for wide applications, for example, tunable integrated optical devices, nanolasers and sensors.

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“…II) The second one is based on the mode evolution, where the polarization of the photon changes as the waveguide geometry is slowly engineered. Since the waveguide cross sections usually vary in the vertical direction, this type of devices is difficult to fabricate with the top‐down process . III) The third type relies on surface plasmon polaritons, which are excited selectively by perpendicular polarization of photons .…”

Section: Introductionmentioning

confidence: 99%

On‐Chip Polarization Rotators

Hou

Xiong

Cao

et al. 2019

Advanced Optical Materials

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detection, [9,10] sensing, [11][12][13][14] and so on. Specifically, to process polarization-encoded information in PICs, controlling of the polarization states is necessary, which requires the combinations of polarization isolator, polarization rotator, polarizer retarder, and so on. [15][16][17][18] In free space, there are already many examples of implementing polarization manipulation. [19][20][21] Recently, metamaterials also allow polarization conversion with near-perfect conversion efficiency. [22,23] However, we focus on the on-chip polarization conversion using integrated waveguides. So far, the methods for manipulating the polarization states of photons in PICs can be roughly classified into three categories: I) The most common one is to make the waveguide cross-section asymmetric, so that the horizontal and vertical polarization modes are no longer orthogonal and interfere with each other. [24,25] This type of devices requires high accuracy in fabrication and is usually sensitive to wavelength. II) The second one is based on the mode evolution, where the polarization of the photon changes as the waveguide geometry is slowly engineered. Since the waveguide cross sections usually vary in the vertical direction, this type of devices is difficult to fabricate with the top-down process. [26,27] III) The third type relies on surface plasmon polaritons, which are excited selectively by perpendicular polarization of photons. [28,29] In 2015, Zhu's group has demonstrated a plasmonic polarization generator that can reconfigure an input polarization to all types of polarization states simultaneously. [8] Although these plasmonic devices can be made very small (several micrometers), their performance is severely encumbered by the absorption of the metal.For type-II polarization rotators, they have a lot of advantages. For example, their broad bandwidth benefits the operations involving pulsed lasers. And unlike the type-I ones, their requirement on fabrication accuracy is relaxed due to the nature of adiabatic mode evolution. [30,31] Although the top-down lithography techniques are restricted in their fabrication, people have developed many other techniques that can deal with 3D nanostructures, such as self-assembly and 3D printing. [32,33] Femtosecond direct laser writing (fs-DLW) is also one of them, which uses tightly focused ultrashort (fs scale) pulsed laser and changes the optical properties of materials via nonlinear multiphoton absorption. [34] Depending on the different materials and the applied laser power, the material properties may change because of polymerization, reduction, bond cleavage, phase change, and ablation. [35][36][37][38] Due to the small multiphoton absorption cross section and the short On-chip polarization manipulation is proposed via a waveguide that is adiabatically twisted along its longitudinal axis, which can be fundamental building blocks for polarization-encoded optical communication and information processing. With the help of femtosecond direct laser writing, the polarization ...

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Integrated polarization rotator/converter by stimulated Raman adiabatic passage

Cited by 20 publications

References 38 publications

CMOS-compatible highly efficient polarization splitter and rotator based on a double-etched directional coupler

CMOS-compatible highly efficient polarization splitter and rotator based on a double-etched directional coupler

Efficient coupling between dielectric waveguide modes and exterior plasmon whispering gallery modes

On‐Chip Polarization Rotators

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