Full-angle collimations of two-dimensional photonic crystals with ultrahigh-index background materials

Zhang, Hao; Yan, Chao; Chen, Lifan; Zhu, Heyuan; Qian, Liejia; Fan, Dianyuan

doi:10.1088/2040-8978/12/4/045103

Cited by 14 publications

(28 citation statements)

References 24 publications

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“…This idea has been recognized for the first time by Zhang et al [38]. In particular, these authors have pointed out that an ultrahigh-index background material is a key issue in achieving the all-angle SC.…”

Section: Suitability Of 2d Square-array Pcs For the All-angle Broad-mentioning

confidence: 95%

“…1). The SC efficiency can be significantly increased by expanding the incidence-angle range [2,11,23,37,38] or, finally, achieving the all-angle SC. According to the previous studies, the square lattice can ensure the large-angle SC [1], although no all-angle SC is strictly realizable in this structure for the case of flat open EFCs.…”

Section: Suitability Of 2d Square-array Pcs For the All-angle Broad-mentioning

confidence: 99%

“…These three characteristics can greatly enhance the efficiency of the SC and extend its applications [14]. Notice that most of the works reported so far support only one special polarization for the all-angle and broad-band SC, or the all-angle polarization insensitivity is limited to some frequency ranges only [2,11,14,15,22,23,[37][38][39][40][41][42][43][44]. To the best of our knowledge, there have been no reports on the all-angle, polarization-insensitive and, at the same time, relatively broad-band SC.…”

Section: Introductionmentioning

confidence: 99%

“…at increasing the collimating efficiency [34], reducing reflection on the input PC surface [35,36], broadening the working frequency range [2,15,37], expanding the incident-angle range [2,11,23,37,38] and implementation of polarization-insensitive SC [14,22,[39][40][41][42], among many instances. The three latter aspects are extremely attractive from the viewpoint of applications in future photonic integrated systems.…”

Section: Introductionmentioning

confidence: 99%

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An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

Noori¹,

Soroosh²,

Baghban³

2015

Ukr. J. Phys. Opt.

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Abstract. We have investigated the possibility for achieving (in the same structure), an all-angle, polarization-insensitive and broad-band self-collimation (SC), one of the most urgent requirements in the field of optical integration. To obtain these attractive SC features in 2D square-array photonic crystals, we have used several strategies and performed testing calculations, using plane-wave expansion and finite-difference time-domain methods. We have not complicated the basic structure for the SC and ensured its simple geometry. The all-angle SC can arise when the optical material of a hole-type structure is high-index. Our results have testified that the SC in the hole-type structure is less dependent on the light polarization, if compared with a similar rod-type one. Our optimized SC structure has a bandwidth of Δf/f c = 2.61% and supports the all-angle SC for both TE and TM polarizations at the expense of small (~ 3) deviation of light from the unique collimation direction. Notice that the latter can be tolerated in many integrated optical devices.

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Section: Suitability Of 2d Square-array Pcs For the All-angle Broad-mentioning

confidence: 95%

Section: Suitability Of 2d Square-array Pcs For the All-angle Broad-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

Noori¹,

Soroosh²,

Baghban³

2015

Ukr. J. Phys. Opt.

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show abstract

“…At the same time, some recent works have made positive efforts from several aspects to improve the performance of self-collimation, e.g., broadening the working frequency range [16][17][18], reducing the reflection on PhC input surfaces [19][20][21], realizing polarization-insensitive self-collimation (PISC) [22][23][24][25], and expanding the incident angle range [16,18,[26][27][28]. Particularly, the latter two aspects are extremely attractive because they can greatly enhance the collimating efficiency of self-collimation and extend its application.…”

Section: Introductionmentioning

confidence: 99%

Polarization-insensitive and broad-angle self-collimation in a two-dimensional photonic crystal with rectangular air holes

Jiang

2013

Appl. Opt.

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In this paper, we have systematically investigated the polarization-insensitive and broad-angle self-collimation behavior in a square-lattice two-dimensional photonic crystal (PhC) with rectangular air holes. By analyzing the band structures and the corresponding equi-frequency contours (EFCs), it is found that such PhC can show special dispersion properties when the half-length L and half-width W of rectangular air holes are appropriately changed. First, compared with conventional square-lattice PhCs with circular or square air holes, such PhC is easier to support polarization-insensitive self-collimation (PISC) based on the EFCs for the second band. Meanwhile, the PISC behavior such as working frequency range and effective incident angle can be more flexibly adjusted by changing the structural parameters of rectangular air holes. Second, such PhC can show long flat EFCs for the TM-3 band. This is quite helpful for supporting broad-angle self-collimation. In particular, when L=0.5a and W/L=0.8, this PhC will degenerate to a one-dimensional grating PhC. It can show good all-angle self-collimation behavior with an improved relative bandwidth (about 19.98%) compared with previous works. It also presents advantages in practical applications due to a relatively convenient fabrication process.

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Self‐Collimation in Photonic Crystals: Applications and Opportunities

2017

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A comprehensive review considering recent advances in self-collimation and its applications in optical integration is covered in the current article. Self-collimation is compared to the conventional technique of photonic bandgap engineering to control the light propagation in photonic crystal-based structures. It is fully discussed how the self-collimation phenomenon can be tailored to be independent of the incident angle and polarization. This adds substantial flexibility to the structure to overcome light coupling challenges and simultaneously aids in the omission of bulk and challenging elements, including polarizers and lenses from optical integrated circuits. Additionally, designed structures have the potential to be rescaled to operate in any desired frequency range thanks to the scalability rule in the field of electromagnetics. Moreover, it is shown that one can boost the coupling efficiency by applying an anti-reflection property to the structure, which provides not only efficient index matching but also the matching between external waves with uniform amplitude and Bloch waves with periodic amplitude.

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Full-angle collimations of two-dimensional photonic crystals with ultrahigh-index background materials

Cited by 14 publications

References 24 publications

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

Polarization-insensitive and broad-angle self-collimation in a two-dimensional photonic crystal with rectangular air holes

Self‐Collimation in Photonic Crystals: Applications and Opportunities

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