“…For instance, to realize less than 10 mm TMFP, the media concentration must be at least 5% in our scattering media. In previous work 32 , the non-diffractive beam is maximized up to 2.4 mm TMFP, which is near to TMFP value of the human muscle 33 . Figure 3 The variation between transport mean free path and media concentration from 0.1 to 100%.…”
Section: Methods and Resultsmentioning
confidence: 74%
“…The main narrow central intensity and the hill-like broadened light intensity under the central intensity are constructed by forward and multiple scattered lights, respectively. 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 .…”
Section: Methods and Resultsmentioning
confidence: 99%
“…For evaluating the intensity of the non-diffractive beam, we define the center intensity ratio, r i , as 32 where V p and V s are the normalized intensity at the position of peak and trough of the beam intensity profile. This ratio can also mean as the intensity ratio between the non-diffractive beam and the multiple scattering lights at the center position.…”
Section: Methods and Resultsmentioning
confidence: 99%
“…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 .…”
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.
“…For instance, to realize less than 10 mm TMFP, the media concentration must be at least 5% in our scattering media. In previous work 32 , the non-diffractive beam is maximized up to 2.4 mm TMFP, which is near to TMFP value of the human muscle 33 . Figure 3 The variation between transport mean free path and media concentration from 0.1 to 100%.…”
Section: Methods and Resultsmentioning
confidence: 74%
“…The main narrow central intensity and the hill-like broadened light intensity under the central intensity are constructed by forward and multiple scattered lights, respectively. 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 .…”
Section: Methods and Resultsmentioning
confidence: 99%
“…For evaluating the intensity of the non-diffractive beam, we define the center intensity ratio, r i , as 32 where V p and V s are the normalized intensity at the position of peak and trough of the beam intensity profile. This ratio can also mean as the intensity ratio between the non-diffractive beam and the multiple scattering lights at the center position.…”
Section: Methods and Resultsmentioning
confidence: 99%
“…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 .…”
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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