SPIE Optical Metrology 2015: The week's highlights from Munich
John Dudley, chair of the International Year of Light steering committee, addresses the Students and SPIE Fellows Luncheon on Thursday, 25 June, in Munich.
From Picasso to Pollock, photonics studies art
The opening presentation Thursday in the “Optics for Arts, Architecture, and Archeology” conference was an invited talk by John Delaney of the National Gallery of Art who described the design, construction and performance of a near infrared hyperspectral camera for use in studying paintings. Reflection imaging spectroscopy, which consists of collecting images in spectral bands to obtain a spectral mapping of a region of interest, is an important technique in cultural heritage studies since it provides both spectral and spatial information. The system discussed in this study operated in the NIR range of 1000-2500nm with a spectral sampling size of 2.8nm and spatial resolution at the painting of 0.16mm. Examples cited included pigment studies of Pacino’s “Christ in Majesty with Twelve Apostles.” A study of binders in Jackson Pollock’s “Lavender Mist” showed the presence of two titanium white paints, one oil-based and one alkyd-based, and illustrated the different drying properties of the two types of paints. In Picasso’s "Le Gourmet," the imaging method was able to clearly identify an image underneath the surface, allowing for a computer reconstruction of the underlying image. This paper clearly demonstrates the value of photonics-based technologies in the study of artwork.
Testing your own eyesight with photonics!
Finding information in noise, imaging at high speeds, and driving the intersection of technology with the needs of the developing world are all themes in the lab of Ramesh Raskar of the MIT Media Lab who presented the plenary talk Wednesday. Raskar provide the audience with a tour of the work being done in his lab. Reconstructing the paths taken by photons undergoing multiple reflections allows for determining scenes in cases without direct line of sight or "seeing around corners." Using time-of-flight measurements allows for reconstruction of the scene behind thick diffusers or "seeing behind walls." High speed femto- and nanosecond photography allows visualization of light in motion and of plasma formation. Combining a smartphone with the appropriate illumination scheme allows for a mobile way to conduct retinal scans for visual health information. Early in his talk, Raskar said that every photon has a story; the diverse set of work done in his lab shows that he and his team are uncovering those stories and deepening our understanding of the possibilities made available with light.
Honoring outstanding achievement
|Kazuyoshi Itoh (L) and Toyohiko Yatagai
SPIE President Toyohiko Yatagai presented the Dennis Gabor Award to Kazuyoshi Itoh, Osaka University, at today's plenary presentation. Itoh was awarded the honor in recognition of his eminent contribution to the development of incoherent holography and nonlinear optical microscopy through his pioneering work on coherence-based multispectral and 3D imaging, and nonlinear optical imaging and manipulations of biological and inorganic industrial materials. Itoh, and SPIE Fellow, Itoh has presented numerous invited papers at SPIE conferences. He was the president of the Optical Society of Japan (OSJ) from 2006 to 2008 and now he is currently a member of the Science Council of Japan.
SPIE presents the Dennis Gabor Award every year to recognize outstanding accomplishments in diffractive wavefront technologies, especially those that further the development of holography and metrology applications.
Preserving our cultural heritage
Femtosecond pump-probe microscopy is well-known for its use in biomedical imaging. In his invited talk as part of the "Optics for Arts, Architecture, and Archeology" conference, Warren Warren of Duke University described the use of such an arrangement for cultural heritage studies. For paintings, variations in the pump-probe decay signal readily permit differentiation between various pigments providing researchers with information pertaining to the date and artist of the work under study. Pump-probe setups can be used for imaging and to create virtual cross-sections which provides insight into layering and brush strokes which can be used in determining the artist of a painting. The method can also be used to identify and study mold growth, an important aspect of preservation. These techniques are not limited to paintings as was demonstrated with an example citing pottery where pump-probe analysis can provide details into the firing process. This presentation, and others in this conference, illustrate both the versatility of laser processes to be applied to a wide range of applications as well as the diversity of lasers and optics in applications of cultural heritage preservation.
Biophotonics industry profile, poster session
SPIE Industry and Market Strategist Stephen Anderson presented analysis of the size of the photonics industry and new data specific to biophotonics and biomedical optical systems including economic impact, geographic distribution, and associated revenue trends.
The European Conference on Biomedical Optics in Munich, co-located with Optical Metrology and organized in 2015 by SPIE, is a forum for nearly 450 scientists, researchers, and engineers to share their recent results with the global community. See news from Biomedical Optics.
Conferences begin in Munich
The European Optical Metrology symposium began on Monday with three conferences in session. The "Videometrics, Range Imaging, and Applications" conference started with an invited talk from Bernd Jähne of the University of Heidelberg who discussed light field-based videometry. This technique combines the strengths of traditional methods thereby providing a generalized approach to 3D imaging. In unifying optical metrology and computer vision techniques this approach has the potential to achieve photogrammatic accuracies with any type of surface and provide a pathway to new, disruptive optical 3D imaging techniques and applications.
The keynote presentation for the "Optical Methods for Inspection, Characterization, and Imaging of Biomaterials" conference was provided by Changhuei Yangof the California Institute of Technology who descr ibed the Fourier ptychography microscopy method used in his lab. This computational microscopy method uses sequential illumination of elements of an LED array replacing the traditional illumination system in conjunction with a low NA lens and Fourier analysis techniques to address current optical microscopy shortcomings. The technique is well-suited to digital pathology applications and is compatible with fluorescence imaging applications.
The use of Airy beams for single plane illumination microscopy (SPIM) was the topic of an invited presentation by Kishan Dholakia of the University of St. Andrews. Light sheet microscopy is gaining popularity in the life sciences as an imaging modality since it provides a rapid, wide-field-of-view imaging scheme with low sample phototoxicity. Typically Gaussian beams and, lately, Bessel beams have been used with SLIM. This talk demonstrated some of the advantages of Airy beams in terms of resolution and field of view compared to its counterparts.
Gabriel Popescu of the University of Illinois at Urbana-Champaign provided an invited talk exploring the use of spatial light interference microscopy (SLIM) for histopathology applications focusing on the case of prostate cancer diagnosis. The talk illustrated that quantitative phase imaging (QPI) techniques have the potential of providing label-free, high throughput characterization of tissue samples sensitive to the tissue nanostructure. QPI can provide a means for robust quantitative analysis of such samples reducing the variation in diagnoses common with today's qualitative, subjective characterization methods.
Professional Development series expands to Europe
The student professional development workshops expanded in Munich this year due to the increasing number of SPIE Student Members and Student Chapters. The workshops included Effective Technical Presentations, Effective Scientific Papers and the art of persuasion. Being able to persuade others is an essential skill for a successful career; the persuasion workshop was particularly popular as students learned new skills on how to convince other students to join and participate in their student chapter activities.
Training for the future's leaders
SPIE student chapter leaders from around the world gathered in Munich on Saturday for an all-day leadership training. The Student Chapter Leadership Workshop, moderated by Jean-luc Doumont, Principiae, focused on the qualities of a good leader and how to apply those when running their student chapter. Students had the opportunity to problem solve real life chapter problems and network with other students from 30 countries and 18 different chapters.
"The comprehensive experience provided by the SPIE workshop fosters a greater realization for student leaders than simply professional growth," said Haley Marks, student chapter president at Texas A&M University. "The more important, more emotional realization for me was the take-away message that it is empathy and positive interactions within a team that allow for our future success as leaders."
Attending a Student Chapter Leadership Workshop is one of the benefits SPIE provides to its chapters, helping building leaders in their communities and in optics and photonics.
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