Dynamic beam-steering by a pair of rotating diffractive elements

Bawart, Martin; Bregenzer, Nicola; Bernet, Stefan; Ritsch‐Marte, Monika

doi:10.1016/j.optcom.2019.125071

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…When compared to a traditional grating scanner that employs two adjoining gratings, this method offers the advantage of defocusing unwanted diffraction orders, thus enhancing the system's performance. [53] Various Challenges and solutions in automotive LiDAR sensors are compared and outlined in Table 1.…”

Section: Ghost Imagementioning

confidence: 99%

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Recent Advances in Light Detection and Ranging: Optical Modulation Solutions and Novel Nanotechnologies

Chen,

Miao,

Hong

et al. 2023

Adv Quantum Tech

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Light detection and ranging (LiDAR) sensor is widely recognized as a critical component for accurate perception. However, there are a host of challenges that impede their performance, including low spatial resolution, high costs, large size, low reliability, and susceptibility to interference. It is challenging to overcome these issues using a single LiDAR module, necessitating the need for a review of current LiDAR technologies. The paper commences by introducing the fundamental principles of various laser rangefinders and discussing the optical modulation technologies used to prevent interference and ghost images. Next, the paper delves into the latest developments in laser technology, with a focus on enhancing the switching rate, compliance with eye safety regulations, miniaturization, and improving stability. One highly promising innovation is the photonic crystal surface emitting laser (PCSEL), a novel light source that boasts high‐speed, small divergence angles, and high‐power output. Finally, the paper discusses the advancements made in non‐solid‐state scanning and solid‐state scanning, such as improving stability, increasing scanning angles, and optimizing the manufacturing of mechanical and micro‐electromechanical systems (MEMS). Additionally, the paper highlights the recent advancements in nanotechnology, specifically metasurface technology, which offers superior capabilities such as beam deflection, enhanced field‐of‐view (FOV), and dynamic modulation.

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Section: Ghost Imagementioning

confidence: 99%

mentioning

confidence: 99%

Recent Advances in Light Detection and Ranging: Optical Modulation Solutions and Novel Nanotechnologies

Chen,

Miao,

Hong

et al. 2023

Adv Quantum Tech

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show abstract

“…There have been many studies based on the combination of these two principles, for example, the varifocal meta‐lens system can realize sectioning fluorescence microscopy imaging for biological research, [ 12 ] the moiré meta‐device can flexibly realize the terahertz Bessel beam generation with adjustable order and non‐diffracting focal length, [ 29 ] the LC moiré lens can realize high dynamics edge detection, [ 17 ] and varifocal Alvarez lenses alleviate vergence‐accommodation conflict (VAC) for near‐eye displays. [ 30 ] In addition, the combination of diffractive optical elements (DOE) based on dynamic phase and moiré effect can realize a varifocal Fresnel lens, [ 31 ] varifocal axicon, [ 32 ] helical phase plate with adjustable helical index, [ 33 ] dynamic beam steering, [ 34 ] and zoomable telescopic system. [ 35,36 ] Recently, diffractive optical moiré lenses have theoretically and experimentally realized multi‐order moiré lenses with longitudinal chromatic aberration correction and varifocal function, which provides the possibility for white light imaging applications.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband Moiré‐PB Doublet Lens for Multifunctional Microscopy

Ye,

Xue,

Zhou

et al. 2023

Advanced Optical Materials

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Liquid crystal superstructures or metasurfaces based on Pancharatnam−Berry (PB) phase have made remarkable progress in all‐optical image processing due to the advantages of miniaturization, integration, and multi‐dimensional light field modulation. However, conventional static PB phase devices are usually not tunable and with a single function. Here, based on the tunability of the moiré effect, the wavelength‐independent effect of the PB phase, and the principle of retardation compensation, an ultra‐broadband multifunction moiré‐PB doublet lens is designed, which can realize optical edge imaging with a tunable resolution ranging from 13.2 to 57.2 µm and ultra‐broadband conventional and polarimetric imaging to meet the requirement of multiple functionalities and system integration. In addition, edge feature extraction or edge imaging of low‐contrast biological samples is also realized. Benefiting from the characteristics of miniaturization, switchable multiple imaging functions, and real‐time parallel processing, this method may expand the practicability of modern optical image processing, microscopic imaging, and biomedicine.

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“…The common solutions to control light beams include using arrangements of galvo mirrors or pairs of rotatable Risley prisms. Risley prism systems (RPSs) are simple and low cost while particularly effective in continuously scanning the light beams; they have attracted much attention from researchers [1][2][3][4][5][6][7][8][9][10][11][12] in the past several decades. Advantages of RPSs include compact size, stability, high precision and resolution, high reliability, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Advantages of RPSs include compact size, stability, high precision and resolution, high reliability, etc. Different mathematical models on the forward and inverse formulas [4][5][6][7][8][9][10][11][12] with different prism configurations have been implemented to provide scan patterns for the control of light beams. All these conventional methods are based on the classic refraction theorem 13 , namely Snell's law.…”

Section: Introductionmentioning

confidence: 99%

Analytic Solution for Double Optical Metasurface Beam Scanners

Wang

Chen

et al. 2021

Preprint

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Optical metasurfaces are researched more and more intensively for the possible realization of lightweight and compact optical devices with novel functionalities. In this paper, a new beam-steering system based on double metasurface lenses (metalenses) is proposed and developed. The proposed system is lightweight, small volume, low cost, and easy to integrate. The exact forward and inverse solutions are derived respectively using the generalized Snell’s law of refraction. Given the orientations of the double metalenses, the pointing position can be accurately determined. If the desired pointing position is given, the required metalenses’ orientations can be obtained by applied global optimization algorithms to solve nonlinear equations related to the inverse problem. The relationships of the scan region and blind zone with the system parameters are derived. The method to eliminate the blind zone is given. Comparison with double Risley-prism systems is also conducted. This work provides a new approach to control light beams.

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Dynamic beam-steering by a pair of rotating diffractive elements

Cited by 14 publications

References 2 publications

Recent Advances in Light Detection and Ranging: Optical Modulation Solutions and Novel Nanotechnologies

Recent Advances in Light Detection and Ranging: Optical Modulation Solutions and Novel Nanotechnologies

Ultra‐Broadband Moiré‐PB Doublet Lens for Multifunctional Microscopy

Analytic Solution for Double Optical Metasurface Beam Scanners

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