Planar polarization-routing optical cross-connects using nematic liquid crystal waveguides

Li, Tenghao; Chen, Qingming; Yu, Weixing; Zhang, Xuming

doi:10.1364/oe.26.000402

Cited by 4 publications

(11 citation statements)

References 43 publications

(65 reference statements)

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“…Even faster switching can be achieved using a thinner channel [3]. The propagation loss in the waveguide is measured to be 9 dB/cm by capturing the topview scattering light field, which is consistent with the previous reports [3,6,10] for the NLCcore waveguide at 532 nm. It is noted that a stronger laser power of about 15 mW is applied in the propagation loss measurement for better sensitivity.…”

Section: Methodssupporting

confidence: 89%

“…The electrically-switchable PR is confirmed in both orthogonal polarization directions (with respect to the substrate plane), and the hysteresis-like phenomenon is also observed during the switching. According to the numerical results in [3], the working wavelength of the planar NLC-PR can also be extended to the near infrared ones, e.g. 1550 nm.…”

Section: Discussionmentioning

confidence: 99%

“…Electrically-switchable polarization rotation (PR) has long been the underlying mechanism for liquid crystal displays, which is induced by the twisted nematic liquid crystal (NLC) to the free-space propagating light [1]. Recently, some numerical studies have been proposed to investigate and apply the fiber/waveguide-based NLC PR [2,3]. The PR for microwave is presented in LC device [4], and the Berry phase PR is also demonstrated in the silicon chip [5].…”

Section: Introductionmentioning

confidence: 99%

“…NLC-based optical switches [3], flexible photonic devices [17], and optofluidic photonic integrated circuits [10].…”

mentioning

confidence: 99%

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Electrically controlled polarization rotator using nematic liquid crystal

Li¹,

Chen²,

Zhang³

2018

Opt. Express

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Here we report a planar polarization rotator using a nematic liquid crystal waveguide, which is subject to a gradient electric field in parallel to the waveguide substrate plane. The fabricated polydimethylsiloxane (PDMS) device has demonstrated the electricallycontrolled polarization rotation at a switching time of 70 ms and a propagation loss of 9 dB/cm at 532 nm. The unique features such as planar form, electric control, and soft material allows integration into planar lightwave circuits and flexible photonics.

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Section: Methodssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…NLC-based optical switches [3], flexible photonic devices [17], and optofluidic photonic integrated circuits [10].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Electrically controlled polarization rotator using nematic liquid crystal

Li¹,

Chen²,

Zhang³

2018

Opt. Express

Self Cite

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“…For a more detailed acquaintance with the latest achievements in this rapidly developing branch of science and technology, we strongly recommend that you familiarize yourself with the publications. 3–18…”

Section: Introductionmentioning

confidence: 99%

Properties of liquid-crystal wave-guiding structures

et al. 2022

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Effect of surface anchoring energy on a liquid crystal optical waveguide-based polarization rotator

Zha

2024

J. Opt. Soc. Am. A

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This study reports the effect of the surface anchoring energy of a liquid crystal (LC) cell on the performance of the liquid crystal optical waveguide polarization rotator (LCOW-PR) for the purpose of providing a theoretical reference for practical preparation of the LCOW-PR. First, the expression for the deflection angle of the director at the boundary of the LC cell is derived so that the distributions of the director and dielectric tensor of the LC can be accurately solved under any anchoring energy. On this basis, the correlation between the crucial indicators such as the polarization conversion length (PCL) together with the polarization conversion efficiency (PCE) of the LCOW-PR and the anchoring effect strength is constructed by combining with the existing numerical algorithms. The numerical results show that the maximum variation of the PCL is lower than 0.1 µm as the anchoring effect strength increases from 1×10−6J/m2 to 1×10−3J/m2, while the PCE decreases from 99.72% to 78.33%. This implies that the PCL of the LCOW-PR does not depend on the surface anchoring energy, but the anchoring effect strength of the orientational layer must be controlled to the order of 10−6J/m2 or even lower to achieve high-performance conversion between the polarization modes. Simultaneously, the effectiveness of the calculations in this work is verified with the help of the coupled mode theory as well as a comparison to previous reports.

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Planar polarization-routing optical cross-connects using nematic liquid crystal waveguides

Cited by 4 publications

References 43 publications

Electrically controlled polarization rotator using nematic liquid crystal

Electrically controlled polarization rotator using nematic liquid crystal

Properties of liquid-crystal wave-guiding structures

Effect of surface anchoring energy on a liquid crystal optical waveguide-based polarization rotator

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