Photonic quasi-crystal fiber with high birefringence

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A dual-cladding photonic quasi-crystal fiber is theoretically proposed to robustly transmit orbital angular momentum (OAM) modes. This fiber, based on conventional silica background, can lift the effective index separation of constituent vortex modes to the order of 10 −2 in the band of >200 nm, surpassing two orders of magnitude than that of common silica-based fibers. Moreover, the effective index separations in first order group (TE 01 , HE 21 , and TM 01 ) present an opposite and near-linear variation with the increase of air-filling fraction of inner and outer cladding. The mode TE 01 can simultaneously realize an ultra-flattened dispersion with a maximum variation of 19.736 ps/nm/km and low confinement loss of order of 10 −2 dB m −1 within a 400 nm bandwidth covering the communication bands of E, S, C, L and U. Detailed investigation on bend-induced influence shows that this fiber can remain well OAM propagation property with the bending radius being more than 30 μm. In addition, the robustness of OAM property is also stressed with assuming ±3% deviation of diameter of all air holes due to imperfect fiber preparation. This design is expected for the application of OAM optical communication system and to provide guidance for engineering the large-indexseparation fiber.

Section: Introductionmentioning

confidence: 99%

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

Liu¹,

Tan²,

Yan³

et al. 2019

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“…Over the last two decades, many applications of photonic quasi-crystals (PQCs) have been discovered and investigated [1]. These include lenses [2][3][4][5][6] for focusing, imaging and generation of terahertz hollow beams, prisms [7], filters [8], and fibers [9][10][11][12]. Compared to conventional photonic crystal fibers (PCFs) [13], photonic quasi-crystal fibers (PQFs) can produce strong birefringence [11,12], near-zero flattened dispersion [10], and strong nonlinearity [14].…”

Section: Introductionmentioning

confidence: 99%

“…These include lenses [2][3][4][5][6] for focusing, imaging and generation of terahertz hollow beams, prisms [7], filters [8], and fibers [9][10][11][12]. Compared to conventional photonic crystal fibers (PCFs) [13], photonic quasi-crystal fibers (PQFs) can produce strong birefringence [11,12], near-zero flattened dispersion [10], and strong nonlinearity [14]. Until now, both Penrose-type PQFs [10,11] and Stampfli-type PQFs [12,14] have not been manufactured in practice.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to conventional photonic crystal fibers (PCFs) [13], photonic quasi-crystal fibers (PQFs) can produce strong birefringence [11,12], near-zero flattened dispersion [10], and strong nonlinearity [14]. Until now, both Penrose-type PQFs [10,11] and Stampfli-type PQFs [12,14] have not been manufactured in practice. Sunflowertype PQFs, however, were fabricated successfully using the sol-gel method [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polarization filtering in the visible wavelength range using surface plasmon resonance and a sunflower-type photonic quasi-crystal fiber

Yan¹,

Wang²,

Liu³

et al. 2018

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A novel polarization filter based on a sunflower-type photonic quasi-crystal fiber (PQF) is proposed in this paper. We also discuss different methods to tune the filter wavelength. The proposed filter can efficiently produce polarized light with visible wavelengths by using the resonance between the second-order surface plasmon polariton mode and the core mode of the PQF. The filtered wavelength can be tuned between 0.55 µm and 0.68 µm by adjusting the thickness of the gold film. When the thickness of the gold film is 25.3 nm, the resonance loss in the y-polarized direction reaches 11707 dB m−1 for a wavelength of 0.6326 µm, and the full width at half maximum is only 5 nm. Due to the flexible design and absence of both polarization coupling and polarization dispersion, this polarization filter can be used in devices that require narrow-band filtering.

“…The ordered structure arrangement makes the PCs characterized with the features such as photonic band gap, photonic localization and negative refraction. The characteristics of PCs could provide wide primary prospect in optical communication and optical integrated systems, including fibers [3][4][5][6][7][8][9], filters [10], prisms [11,12], waveguides [13] and lenses [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Multiband super-resolution imaging of graded-index photonic crystal flat lens

Xie¹,

Wang²,

Ge³

et al. 2018

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Multiband super-resolution imaging of point source is achieved by a graded-index photonic crystal flat lens. With the calculations of six bands in common photonic crystal (CPC) constructed with scatterers of different refractive indices, it can be found that the super-resolution imaging of point source can be realized by different physical mechanisms in three different bands. In the first band, the imaging of point source is based on far-field condition of spherical wave while in the second band, it is based on the negative effective refractive index and exhibiting higher imaging quality than that of the CPC. However, in the fifth band, the imaging of point source is mainly based on negative refraction of anisotropic equi-frequency surfaces. The novel method of employing different physical mechanisms to achieve multiband super-resolution imaging of point source is highly meaningful for the field of imaging.