Optical temperature sensor using speckle field

Trivedi, Vismay; Mahajan, Swapnil; Chhaniwal, Vani K.; Zalevsky, Zeev; Javidi, Bahram; Anand, Arun

doi:10.1016/j.sna.2014.06.006

Cited by 33 publications

(21 citation statements)

References 14 publications

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“…which is also equal to common 2  2 coherency matrix [25]. We find the same strategy could be extended to measure general N  N coherency matrix; but, it now requires at least 4 measurements per each 11 , rs and 22 , rs pairs. This is not impossible, but going to be very tedious especially due to the scanning spatial mode pairs.…”

Section: B Mixed Statesmentioning

confidence: 98%

Interpreting Intensity Speckle as the Coherency Matrix of Classical Light

Lee

Park

2019

Phys. Rev. Applied

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We show that an intensity speckle can be directly interpreted as the properties of incident lightamplitude, phase, polarization, and coherency over spatial positions. Revisiting the speckle-correlation scattering matrix (SSM) method [Lee and Park, Nat. Comm. 7, 13359 (2016)], we successfully extract the intact information of incident light from an intensity speckle snapshot as the form of coherency matrix. The idea is verified experimentally by introducing the peculiar states of light that exhibit uneven amplitude, phase, polarization, and coherency features. We also find substantial practical advantage of the proposed method compared to the conventional coherency matrix measuring techniques such as Stokes polarimetry. We believe this physical interpretation of an intensity speckle could open a new avenue to study and to utilize the speckle phenomenon in vast subfields of wave physics.

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Section: B Mixed Statesmentioning

confidence: 98%

Interpreting Intensity Speckle as the Coherency Matrix of Classical Light

Lee

Park

2019

Phys. Rev. Applied

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“…One of the major drawbacks was that, in most cases, the disordered medium is irreproducible and therefore require extensive characterization processes for each disordered medium . In addition, the optical response of the medium is highly sensitive to environmental conditions, such as temperature, pressure, and humidity. In fact, a precise alignment of the incident wavefront upon the disordered medium within a range comparable to optical wavelengths is desirable to guarantee high fidelity .…”

Section: Light Control With Active Disordered Materialsmentioning

confidence: 99%

Disordered Optics: Exploiting Multiple Light Scattering and Wavefront Shaping for Nonconventional Optical Elements

Park

Lee

et al. 2019

Advanced Materials

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Advances in diverse areas such as inspection, imaging, manufacturing, telecommunications, and information processing have been stimulated by novel optical devices. Conventional material ingredients for these devices are typically made of homogeneous refractive or diffractive materials and require sophisticated design and fabrication, which results in practical limitations related to their form and functional figures of merit. To overcome such limitations, recent developments in the application of disordered materials as novel optical elements have indicated great potential in enabling functionalities that go beyond their conventional counterparts, while the materials exhibit potential advantages with respect to reduced form factors. Combined with wavefront shaping, disordered materials enable dynamic transitions between multiple functionalities in a single active optical device. Recent progress in this field is summarized to gain insight into the physical principles behind disordered optics with regard to their advantages in various applications as well as their limitations compared to conventional optics.

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“…Speckles are often considered as a noise in a coherent imaging system that degrade image contrast 27,28 . However, due to their high sensitivity to the changes in optical phase, speckles have also been exploited to develop sensors for various purposes such as pressure 29 , temperature 30 , and mechanical vibrations 31 . In biomedical applications, laser speckle contrast imaging has widely been used for blood flow measurement 32,33 , microorganism detection 34,35 , and studying drug action on parasites 36 .…”

Section: Introductionmentioning

confidence: 99%

Rapid antimicrobial susceptibility test using spatiotemporal analysis of laser speckle dynamics of bacterial colonies

Han

Baek

et al. 2019

Preprint

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Antimicrobial susceptibility testing (AST) is crucial for providing appropriate choices and doses of antibiotics to patients.However, standard ASTs require a time-consuming incubation of about 16-20 h for visual accumulation of bacteria, limiting the use of AST for an early prescription. In this study, we propose a rapid AST based on laser speckle formation (LSF) that enables rapid detection of bacterial growth, with the same sample preparation protocol as in solid-based ASTs.The proposed method exploits the phenomenon that well-grown bacterial colonies serve as optical diffusers, which convert a plane-wave laser beam into speckles. The generation of speckle patterns indicates bacterial growth at given antibiotic concentrations. Speckle formation is evaluated by calculating the spatial autocorrelation of speckle images, and bacterial growth is determined by tracking the autocorrelation value over time. We demonstrated the performance of the proposed method for several combinations of bacterial species and antibiotics to achieve the AST in 2-4.5 hours.Furthermore, we also demonstrated the sensitivity of the technique for low bacterial density. The proposed method can be a powerful tool for rapid, simple, and low-cost AST.

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Optical temperature sensor using speckle field

Cited by 33 publications

References 14 publications

Interpreting Intensity Speckle as the Coherency Matrix of Classical Light

Interpreting Intensity Speckle as the Coherency Matrix of Classical Light

Disordered Optics: Exploiting Multiple Light Scattering and Wavefront Shaping for Nonconventional Optical Elements

Rapid antimicrobial susceptibility test using spatiotemporal analysis of laser speckle dynamics of bacterial colonies

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