Alwin Kienle
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View article: Optical property-based rendering of 3D prints: erratum
Optical property-based rendering of 3D prints: erratum Open
In the original article ( Opt. Express 33 , 15187 ( 2025 ) 10.1364/OE.553642 ) [1], the discussion of certain related works was incomplete. Including these references provides additional context and places the topics examined in a broader …
View article: Spectrally-resolved errors in absorption and reduced scattering due to <i>µ</i> <sub>a</sub> - <i>µ</i> <sub>s</sub> ’ cross-talk in layered media
Spectrally-resolved errors in absorption and reduced scattering due to <i>µ</i> <sub>a</sub> - <i>µ</i> <sub>s</sub> ’ cross-talk in layered media Open
Spatially-resolved reflectance (SRR) techniques are essential for in vivo noninvasive optical characterization of biological tissue. Under the common assumption of a single-layer volume to approximate human skin tissue, the long-standing i…
View article: Optical finger phantom with realistic optical properties
Optical finger phantom with realistic optical properties Open
Existing optical phantoms often do not represent realistic optical and geometrical properties. This study aimed to fabricate a homogeneous silicone finger phantom that closely mimics the reflectance and transmittance characteristics of a h…
View article: Determination of Quantum Yield in Scattering Media Using Monte Carlo Photoluminescence Cascade Simulation and Integrating Sphere Measurements
Determination of Quantum Yield in Scattering Media Using Monte Carlo Photoluminescence Cascade Simulation and Integrating Sphere Measurements Open
Accurate determination of the quantum yield (Φf) in scattering media is essential for numerous scientific and industrial applications, but it remains challenging due to re-absorption and scattering-induced biases. In this study, we present…
View article: Absolute Measurement of Coherent Backscattering Using a Spatial Light Modulator for Coherence Modification
Absolute Measurement of Coherent Backscattering Using a Spatial Light Modulator for Coherence Modification Open
Coherent backscattering is an interference phenomenon that occurs in the backwards direction of the incident illumination. It arises from photons traveling the same path in opposite directions within a scattering medium. Accurately determi…
View article: Simulating Pulp Vitality Measurements via Digital Optical Twins: Influence of Dental Components on Spectral Transmission
Simulating Pulp Vitality Measurements via Digital Optical Twins: Influence of Dental Components on Spectral Transmission Open
Optical diagnostic techniques represent an attractive complement to conventional pulp vitality tests, as they can provide direct information about the vascular status of the pulp. However, the complex, multi-layered structure of a tooth si…
View article: Simulating Pulp Vitality Measurements via Digital Optical Twins: Influence of Dental Components on Spectral Transmission
Simulating Pulp Vitality Measurements via Digital Optical Twins: Influence of Dental Components on Spectral Transmission Open
Optical diagnostic techniques represent an attractive complement to conventional pulp vitality tests, as they can provide direct information about the vascular status of the pulp. However, the complex, multi-layered structure of a tooth si…
View article: Physically accurate rendering of translucent objects
Physically accurate rendering of translucent objects Open
Accurately recreating the appearance of translucent materials poses a substantial challenge in physically based rendering, primarily due to limitations in capturing complex light transport, especially subsurface scattering. Current methods…
View article: Hybrid Method for Solving the Radiative Transport Equation
Hybrid Method for Solving the Radiative Transport Equation Open
The spherical harmonics method (PN method) is often used for solving the radiative transport equation in terms of analytical functions. A severe and unsolved problem in this context was the evaluation of the angle-resolved radiance near so…
View article: <sup>13</sup> C hyperpolarization with nitrogen-vacancy centers in micro- and nanodiamonds for sensitive magnetic resonance applications
<sup>13</sup> C hyperpolarization with nitrogen-vacancy centers in micro- and nanodiamonds for sensitive magnetic resonance applications Open
Nuclear hyperpolarization is a known method to enhance the signal in nuclear magnetic resonance (NMR) by orders of magnitude. The present work addresses the 13 C hyperpolarization in diamond micro- and nanoparticles, using the optically pu…
View article: Optical property-based rendering of 3D prints
Optical property-based rendering of 3D prints Open
The increasing use of colored materials in 3D printing enables the creation of complex structures with realistic color appearances. Ensuring that the printed colors match the design requires advanced rendering methods to accurately predict…
View article: Flow Raman Spectroscopy for the Detection and Identification of Small Microplastics
Flow Raman Spectroscopy for the Detection and Identification of Small Microplastics Open
The most commonly used methods for the detection and identification of small microplastics generally require a complex sample preparation procedure and only allow for static measurements. Quality control of food and drinking water therefor…
View article: Physically accurate rendering of translucent objects
Physically accurate rendering of translucent objects Open
Accurately recreating the appearance of translucent materials poses a substantial challenge in physically based rendering, primarily due to limitations in capturing complex light transport, especially subsurface scattering. Current methods…
View article: Advanced Monte Carlo methods for deriving optical properties of scattering media using cubic spline-parameterized phase functions
Advanced Monte Carlo methods for deriving optical properties of scattering media using cubic spline-parameterized phase functions Open
In this study, we conducted optical goniometric measurements of turbid media and utilized a Monte Carlo model to characterize their optical properties. Our methodology employs an inverse fitting approach that combines Monte Carlo simulatio…
View article: The Relationship Between the Optical Properties of Articular Cartilage and the Biomechanical Parameters of the Tissue
The Relationship Between the Optical Properties of Articular Cartilage and the Biomechanical Parameters of the Tissue Open
This study investigates the relationship between the optical properties of articular cartilage with its biomechanical parameters. The absorption and reduced scattering coefficients of articular cartilage, and average maximum penetration de…
View article: Characterization of the Optical Properties of Photoluminescent Turbid Media Using an Integrating Sphere and Monte Carlo Simulations
Characterization of the Optical Properties of Photoluminescent Turbid Media Using an Integrating Sphere and Monte Carlo Simulations Open
In this paper, we report on the measurement of the optical properties (absorption and scattering coefficients) of photoluminescent turbid media using a homemade integrating sphere setup equipped with a tunable monochromatic light source. T…
View article: Auto Aligning, Error-Compensated Broadband Collimated Transmission Spectroscopy
Auto Aligning, Error-Compensated Broadband Collimated Transmission Spectroscopy Open
Broadband spectral measurements of the ballistic transmission of scattering samples are challenging. The presented work shows an approach that includes a broadband system and an automated adjustment unit for compensation of angular distort…
View article: Development of silicone-based phantoms for biomedical optics from 400 to 1550 nm
Development of silicone-based phantoms for biomedical optics from 400 to 1550 nm Open
This work describes the development of silicone-based evaluation phantoms for biomedical optics in the wavelength range from 400 to 1550 nm. The absorption coefficient μ a and the reduced scattering coefficient μ s ′ were determined using …
View article: Theoretical Investigation of the Influence of Correlated Electric Fields on Wavefront Shaping
Theoretical Investigation of the Influence of Correlated Electric Fields on Wavefront Shaping Open
Wavefront shaping is a well-known method of restoring a focus deep within scattering media by manipulating the incident light. However, the achievable focus enhancement depends on and is limited by the optical and geometrical properties of…
View article: Impact of Multi-Scattered LiDAR Returns in Fog
Impact of Multi-Scattered LiDAR Returns in Fog Open
In the context of autonomous driving, the augmentation of existing data through simulations provides an elegant solution to the challenge of capturing the full range of adverse weather conditions in training datasets. However, existing phy…
View article: Visualization of Pulpal Structures by SWIR in Endodontic Access Preparation
Visualization of Pulpal Structures by SWIR in Endodontic Access Preparation Open
Endodontic access preparation is one of the initial steps in root canal treatments and can be hindered by the obliteration of pulp canals and formation of tertiary dentin. Until now, methods for direct intraoperative visualization of the 3…
View article: Optical Goniometer Paired with Digital Monte Carlo Twin to Determine the Optical Properties of Turbid Media
Optical Goniometer Paired with Digital Monte Carlo Twin to Determine the Optical Properties of Turbid Media Open
We present a goniometer designed for capturing spectral and angular-resolved data from scattering and absorbing media. The experimental apparatus is complemented by a comprehensive Monte Carlo simulation, meticulously replicating the radia…
View article: Estimation of Photon Path Length and Penetration Depth in Articular Cartilage Zonal Architecture Over the Therapeutic Window
Estimation of Photon Path Length and Penetration Depth in Articular Cartilage Zonal Architecture Over the Therapeutic Window Open
In this study, for the first time, we estimate the light propagation parameters in articular cartilage.
View article: $^{13}$C Hyperpolarization with Nitrogen-Vacancy Centers in Micro- and Nanodiamonds for Sensitive Magnetic Resonance Applications
$^{13}$C Hyperpolarization with Nitrogen-Vacancy Centers in Micro- and Nanodiamonds for Sensitive Magnetic Resonance Applications Open
Nuclear hyperpolarization is a known method to enhance the signal in nuclear magnetic resonance (NMR) by orders of magnitude. The present work addresses the $^{13}$C hyperpolarization in diamond micro- and nanoparticles, using the opticall…
View article: An Integral-Equation-Based Variance Reduction Method for Accelerated Monte Carlo Simulations
An Integral-Equation-Based Variance Reduction Method for Accelerated Monte Carlo Simulations Open
In this work, we introduce a novel variance reduction approach utilising the integral formulation of the radiative transfer equation to calculate the radiance in a planar symmetric slab geometry. Due to its integral nature, our method offe…
View article: Broadband scattering properties of articular cartilage zones and their relationship with the heterogenous structure of articular cartilage extracellular matrix
Broadband scattering properties of articular cartilage zones and their relationship with the heterogenous structure of articular cartilage extracellular matrix Open
This study provides scattering properties of articular cartilage zones. Such findings support future research to utilize optical simulation to estimate the penetration depth, depth-origin, and pathlength of light in articular cartilage for…
View article: Focusing Coherent Light through Volume Scattering Phantoms via Wavefront Shaping
Focusing Coherent Light through Volume Scattering Phantoms via Wavefront Shaping Open
Manipulating the wavefront of coherent light incident on scattering media to enhance the imaging depth, sensitivity, and resolution is a common technique in biomedical applications. Local phase variations cause changes in the interference …