Design and fabrication of 1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e166" altimg="si6.svg"><mml:mo>×</mml:mo></mml:math>N polarization-insensitive beam splitters based on 2D subwavelength gratings

Wu, Gang; Huang, Yongqing; Duan, Xuan‐Ming; Li, Kai; Ma, Xiaokai; Liu, Tao; Wang, Huanhuan; Ren, Xiaomin

doi:10.1016/j.optcom.2019.124458

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…According to the way of light incidence, the grating can be divided into vertical incidence, Littrow mounting incidence, and second Bragg incidence. Grating ridges also come in a variety of shapes, such as rectangle, triangle, etc Depending on the difference of grating structure, it can be used in various fields [6][7][8][9][10]. The gratings described in this article can be an important element in the laser field from reported works.…”

Section: Introductionmentioning

confidence: 99%

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Fu¹,

Wang²

2020

Laser Phys.

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A polarization-selective bullet-alike reflective grating is described in this paper. Based on the finite element method, the parameters are continuously optimized to obtain the nice structure. During the simulation, within the incident wavelength of 1528–1563 nm or the incident angle range of 49.9–51.4°, the -2nd order of TE-polarized light achieves more than 95% efficient reflection, and the 0th and -2nd order of TM-polarized light achieves more than 40% efficient reflection for two ports. The results show the good process tolerance and incident characteristics of the grating. In addition, the normalized electric field distribution of bullet-alike reflective gratings is analyzed, which explains the complex physical mechanism well. The polarization-selective bullet-alike reflective grating can be well applied in the laser field.

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Section: Introductionmentioning

confidence: 99%

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Fu¹,

Wang²

2020

Laser Phys.

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“…Fang et al reported a silicon-on-insulator-based polarizationinsensitive beam splitter that uses a two-dimensional high-index contrast grating (2D-HCG) [24]. Wu et al proposed a polarization-insensitive beam splitter that uses 2D high index contrast subwavelength gratings to control transmitted light [25]. Xie et al introduced a gold-coated crossed grating which is based on two dimensional (2D) periodic gold nanocylinder structure [26].…”

Section: Introductionmentioning

confidence: 99%

Conical holes arrays for 2 × 2 ports division

Huang,

Wang

2024

Phys. Scr.

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The 2×2 ports division is introduced based on novel conical holes arrays in this paper. Under the normal incidence of wavelength 780 nm, the grating can achieve high efficiency in the orders (±1, 0) and (0, ±1) which are 24.28% and 24.33%. The uniformity (E U) and the extinction rate (E T) are 0.10% and 21.10 dB. Furthermore, the numerical analysis indicates that the proposed grating exhibits a large angular bandwidth of 11° and a wavelength bandwidth of 34 nm when the target condition has diffraction efficiency above 20% for all main diffraction orders. What's more, the results demonstrate that the proposed grating is feasible for practical manufacturing by exhibiting good manufacturing tolerances and high performance. The performance of the grating is so excellent that it has a wide application prospect in interferometers, spectroscopy, optical communications, etc.

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“…However, for as long as grating beam splitters have been developed, researchers have paid less attention to the more difficult design and fabrication of two-dimensional (2D) gratings [21][22][23][24]. The multi-dimensional diffraction properties of 2D gratings can provide more possibilities for various optical systems than those of 1D gratings.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional grating metasurface for communication band under Littrow mounting

Zhu,

Wang

2024

J. Phys. D: Appl. Phys.

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For communication, it is important to reduce the polarization-independence loss, especially for the stereoscopic incidence. A two-dimensional (2D) grating with the cylindrical hole (CDH) array is presented. The grating structure can achieve polarization-independent, high-efficiency and broadband output at the (-1, 0) diffraction order in the communication band. The novel metasurface achieves a diffraction efficiency of over 98% for both TE and TM polarizations at the (-1, 0) diffraction order. In addition, the (0, 0) diffraction order is well suppressed, resulting in extinction ratio of 43.89 dB and 46.18 dB for TE and TM polarization, respectively. In particular, the diffraction efficiency of the structure at the (-1, 0) order of magnitude under two polarizations exceeds 90% in the 1533-1561 nm bandwidth, which is a significant improvement over recently reported 2D gratings of the same type. Furthermore, the proposed structure has good incidence angle bandwidth and fabrication process tolerance, which ensures stable and efficient output in applications and fabrication. These results enrich the research on 2D gratings in the field of communication bands, and the designed grating has great potential for applications in spectroscopy, grating measurement and interferometry.

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Design and fabrication of 1×N polarization-insensitive beam splitters based on 2D subwavelength gratings

Cited by 11 publications

References 15 publications

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Conical holes arrays for 2 × 2 ports division

Two-dimensional grating metasurface for communication band under Littrow mounting

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