Generation control of a non-diffractive beam in random media by adjusting concentration

Peng, Ziqi; Shiina, Tatsuo

doi:10.1016/j.optcom.2017.01.020

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…This central peak is not an Arago spot because the width and intensity are kept during its propagation after the optical cell 32 . As explained below, these central peaks are NDBs resulting from the constructive interference of beams scattering in the forward direction 29 , 30 . Figure 4 a shows the maximum NDBs generated at media concentrations of 0.4, 0.6, 1.0, 5.0 and 22% with their corresponding propagation distances of 30, 20, 10, 5, and 3 cm in scattering media, respectively.…”

Section: Methods and Resultsmentioning

confidence: 97%

“…In those recent studies, the sensing detection limit of scattering media is up to a few millimeters in the viewpoint of microscopic imaging even though NDB is applied. To establish macroscopic sensing of scattering media such as living tissues, we focused on the propagation property of the annular beam in dense scattering media in our previous work 29 – 32 . The NDB was generated under the propagation of a few tens centimeters distance in the dense scattering media with a scattering coefficient of a few cm −1 , which is near to that of human tissues 33 .…”

Section: Introductionmentioning

confidence: 99%

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Exploration for adequate non-diffractive beam generation in dense scattering media

Xiafukaiti

Lagrosas

Shiina

2022

Sci Rep

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The propagation methods of a non-diffractive beam (NDB) for optical sensing in scattering media have been extensively studied. However, those methods can realize the high resolution and long depth of focus in the viewpoint of microscopic imaging. In this study, we focus on macroscopic sensing in living tissues with a depth of a few tens centimeters. An experimental approach for generating adequate NDB in dense scattering media based on the linear relationship between propagation distance and transport mean free path is reported. For annular beams with different diameters, the same changes of the center intensity ratio of NDB are obtained from the experiment results. They are discussed with theoretical analysis. As a result, the maximum center intensity ratio of the adequate generated NDB can be estimated at arbitrary propagation distance in the dense scattering media.

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Section: Methods and Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Exploration for adequate non-diffractive beam generation in dense scattering media

Xiafukaiti

Lagrosas

Shiina

2022

Sci Rep

Self Cite

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“…Since, the center part was subjected to stronger forward scattering at higher concentration in a short-distance random media. As a result, the non-diffracting field is offered the high center intensity in short distance [9].…”

Section: Resultsmentioning

confidence: 99%

“…However, in the case of a non-diffracting beam (NDB), such as Bessel beam, it can propagate over a long distance and keep its narrow beam width, because it does not diffract (self-formation) [6][7][8]. In previous study, it has been confirmed that an annular beam could change its beam shape into quasi-NDB after being scattered several times in random media (10-30cm) [9]. But, variation of NDB in different receiving distance was not clear.…”

Section: Introductionmentioning

confidence: 96%

Lidar transmitter offers “non-diffracting” property through short distance in highly-dense random media

2018

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Non-diffracting beam (NDB) is useful in lidar transmitter because of its high propagation efficiency and high resolution. We aimed to generate NDB in random media such as haze and cloud. The laboratory experiment was conducted with diluted processed milk (fat: 1.8%, 1.1μmφ). Narrow view angle detector of 5.5mrad was used to detect the forward scattering waveform. We obtained the central peak of NDB at the propagation distance of 5cm ~ 30cm in random media by adjusting the concentration of <10%.

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“…However, for the optical power meter, the sensor had a diameter of 1 centimeter hence a wide acceptance angle. The increased in concentration of scattering particles, increased the e ect of multiple scattering which caused the attenuation change of transmittance for 0.17% TiO 2 phantom (Almasian et al, 2015;Kholodnykh et al, 2003;Peng and Shiina, 2017;Shiina, 2017).…”

Section: Extinction Coe Cientmentioning

confidence: 99%

Time-Domain Optical Coherence Tomography System for Determining The Extinction Coefficient and Group Refractive Index of Gelatin-based Skin Phantoms

Galvez

Vallar

Shiina

et al. 2021

Sci. Technol. Indones

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Optical Coherence Tomography (OCT) is a non-invasive, non-destructive optical imaging technique that uses a low coherence interferometer to obtain real-time cross-sectional images of samples. OCT is notably used in biomedical applications including ophthalmology and dermatology. Aside from generating cross-sectional images, axial scans can also provide additional information about its optical properties such as extinction coefficient and refractive index. This study determines the extinction coefficients and group refractive indices of gelatin-based skin phantoms using a portable time-domain (TD) – OCT system. The gelatin-based skin phantoms were fabricated with varying concentrations of titanium dioxide (TiO2), while keeping the amount of both gelatin and water constant. By changing the proportion of the gelatin powder and TiO2, skin phantoms can then be fabricated to mimic various skin conditions, both pathologic and non-pathologic. Results of the study found a positive correlation of extinction coefficient and refractive index with TiO2 concentration. Thus, increasing TiO2 concentration also increases both extinction coefficient and group refractive index. The median extinction coefficient values of the phantoms ranged from 4.29 mm−1 to 8.48 mm−1. Literature showed that the epidermis can have extinction coefficients of 1.64-7.3 mm−1. For refractive indices of the fabricated phantoms, values ranged from 1.32 to 1.48, while studies on human participants showed that human skin has refractive index values of 1.34-1.56. Based on these properties, it is feasible to fabricate phantoms simulating the optical properties of human skin.

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Generation control of a non-diffractive beam in random media by adjusting concentration

Cited by 9 publications

References 27 publications

Exploration for adequate non-diffractive beam generation in dense scattering media

Exploration for adequate non-diffractive beam generation in dense scattering media

Lidar transmitter offers “non-diffracting” property through short distance in highly-dense random media

Time-Domain Optical Coherence Tomography System for Determining The Extinction Coefficient and Group Refractive Index of Gelatin-based Skin Phantoms

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