Lauren Mason – Page 8

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So far Lauren Mason has created 240 blog entries.

Femtosecond Electric-Field Induced Manipulation of Coherent Magnetic Excitation

Abstract: The wildly growing field of antiferromagnetic spintronics is currently addressing several fundamental questions. A major topic of investigation concerns the generation and manipulation of coherent magnons on the ultrafast timescale. The development of novel pulsed-laser sources has enabled scientists to address the following scientific question: which magnetic excited state can be induced by resonantly driving coherent magnons throughout the Brillouin zone? In my talk, I will outline our approach to this open issue, which relies on the resonant drive of pairs of high-energy magnons in the weak ferromagnet α-Fe2O3 (hematite), with wavevector near the edges of the Brillouin zone. This unprecedented concept results in a strong perturbation of the entire magnetic system of the material, in particular: i) magnon modes with different wavevectors are excited and amplified; ii) the eigenfrequencies of magnons are modified, which demonstrates a modification of the magnon dispersion; iii) a coupling between magnon modes that are orthogonal eigenstates of the magnetic Hamiltonian of the material is observed. Additionally, the effect of light on the magnetic system is quantified by quantitatively estimating the modification of the magnetic interactions. All these observations are rationalised in view of a resonant impulsive stimulated Raman scattering mechanism. Our results offer perspectives to establish an all-optical arbitrary tailoring of the spectrum of the magnetic excitations of a given material on the fundamental timescales.

Research Scientist, X-ray Microscopy (STXM)

Lawrence Berkeley National Lab’s (LBNL) Advanced Light Source Division (ALS) has an opening available for a scientist to work on the development and application of coherent soft x-ray microscopy to problems in physics, materials, energy and environmental science.

The ALS is a U.S. Department of Energy (DOE) Office of Science national scientific user facility whose excellent scientific reputation, expert staff, and capabilities in the soft x-ray, hard x-ray, and infrared regimes attract more than 1,800 academic and industrial users each year in disciplines spanning physical, chemical, materials, biological, energy, and Earth sciences. It is one of five Berkeley Lab user facilities that serve a combined 14,000 users annually. The ALS has been a global leader in soft x-ray science for more than two decades and is currently undergoing a large-scale upgrade (ALS-U) that will endow the facility with revolutionary x-ray capabilities. It’s an exciting time to join our team!

In this exciting role, as part of the ALS Microscopy Program, you will take charge of the scanning transmission and ptychography microscope (the endstation at beamline 7.0.1.2, COSMIC Imaging) to support and collaborate with the community of external scientists using the ALS. You will work in a multidisciplinary scientific research environment, collaborating with a variety of colleagues at all levels for day-to-day operations as well as research and instrumentation projects. The ALS offers fantastic opportunities to develop your own research program using state-of-the-art instrumentation in a vibrant scientific environment.

What You Will Do:

Establish day-to-day operations of the scanning x-ray microscopy endstation at ALS beamline 7.0.1.2 and support other scientists in their safe use of this instrument
Maintain, upgrade and develop instrumentation and software for x-ray microscopy as required to support ALS users and to meet emerging needs of the user community
Collaborate with existing ALS users and develop new partnerships for performing state of the art x-ray experiments. Develop a professional network and a research program that align with the strategic goals of the ALS.
Document and communicate your work, including publishing results in peer-reviewed scientific and technical journals, and presenting findings at workshops and conferences

Communicate with ALS Users to plan and prepare for upcoming experiments
Review and analyze experimental data using commercial and custom software. Maintain and develop custom beamline software in collaboration with the Microscopy program and your own network.
Coordinate activities with subject matter experts and technicians, such as safety, mechanical, electrical, vacuum, experiment controls, etc.
Serve the broader scientific community as an expert resource for advisory/organizational committees, journals, and scientists at other institutions
Practice Integrated Safety Management (ISM) in all aspects of your work.
Embrace and practice concepts of Inclusion, Diversity, Equity, and Accountability (IDEA) and Stewardship

What is Required:

Ph.D. in the physical sciences, chemical sciences, or engineering or equivalent experience, as demonstrated by broad knowledge of and experience in synchrotron radiation science and instrumentation.
Demonstrated scientific publication record.
Practical knowledge of physics or materials science and their applications in scientific research.
Understanding of coherent soft x-ray techniques; demonstrated experience in the operation of complex research equipment.
Advanced experience in programming for data analysis and instrument controls.
Ability to teach effective and safe operation of scientific instruments.
Ability to work with and maintain effective professional relationships with scientific staff, technical staff, and with people from diverse backgrounds.
Ability to manage competing priorities, and provide quality work on schedule.
Excellent organizational and problem-solving skills.
Well developed analytical and quantitative skills.
Strong technical and scientific communication skills, both oral and written.
Flexibility to perform other duties as assigned/needed.

Desired Qualifications:

Experience with coherent x-ray spectromicroscopy, and its applications in materials or energy science, magnetism, biomineralization, environmental science or microelectronics.
Experience in other experimental techniques used in a relevant research area, such as coherent x-ray scattering, electrochemistry, microfluidics, thin film sample preparation or microwave excitation.
Experience in developing and troubleshooting experimental instrumentation, with emphasis on nano-motion controls, high vacuum systems, and x-ray detectors.
Two or more years of experience working with x-ray beamlines and endstations.
Ability to lead and drive projects in an interactive team setting.
Ability to write and maintain Python software packages.

Want to learn more about Berkeley Lab’s Culture, Benefits and answers to FAQs? Please visit: https://recruiting.lbl.gov/

For full consideration, please apply by April 15, 2023.

Notes:

This is a full time, 2 years, career-track term appointment that may be renewed to a maximum of five years and that may be converted to career based upon satisfactory job performance, continuing availability of funds, and ongoing operational needs.
This position is expected to pay $7,256.00 – $11,610.00/month, which fits within the full salary range of $7,256.00 – $17,415.00/month for the S13.1 – Physicist Research Sci/Engr. Salary for this position will be commensurate with the final candidate’s qualification and experience, including skills, knowledge, relevant education, certifications, plus also aligned with the internal peer group.
This position may be subject to a background check. Any convictions will be evaluated to determine if they directly relate to the responsibilities and requirements of the position. Having a conviction history will not automatically disqualify an applicant from being considered for employment.
Work will be primarily performed at Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA.

The core values of the ALS reflect a strong commitment to diversity, equity, and inclusion. We seek candidates who will support a culture in which each member of the community feels welcomed and valued. An ongoing commitment to recruiting and retaining a vibrant, diverse, and talented workforce is paramount to promoting a strong and successful lab community. For more information refer to the LBNL core values and the ALS mission statement and core values.

Based on University of California Policy – SARS-CoV-2 (COVID-19) Vaccination Program and U.S Federal Government requirements, Berkeley Lab requires that all members of our community obtain the COVID-19 vaccine as soon as they are eligible. As a condition of employment at Berkeley Lab, all Covered Individuals must Participate in the COVID-19 Vaccination Program by providing proof that vaccination requirements have been met or submitting a request for Exception or Deferral. Visit covid.lbl.gov for more information.

Berkeley Lab is committed to Inclusion, Diversity, Equity and Accountability (IDEA) and strives to continue building community with these shared values and commitments. Berkeley Lab is an Equal Opportunity and Affirmative Action Employer. We heartily welcome applications from women, minorities, veterans, and all who would contribute to the Lab’s mission of leading scientific discovery, inclusion, and professionalism. In support of our diverse global community, all qualified applicants will be considered for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, age, or protected veteran status.

Equal Opportunity and IDEA Information Links:

Know your rights, click here for the supplement: Equal Employment Opportunity is the Law and the Pay Transparency Nondiscrimination Provision under 41 CFR 60-1.4.

Congratulations to Yuka Esashi for Being Awarded the 2023 SPIE Karel Urbánek Best Student Paper Award

At the 2023 Advanced Lithography and Patterning Conference, Yuka Esashi was awarded the SPIE Karel Urbánek Best Student Paper Award for “Multi-modal tabletop EUV reflectometry for characterization of nanostructures.” Congratulations, Yuka!

The Karel Urbánek Best Student Paper Award recognizes the most promising contribution to the field by a student, based on the technical merit and persuasiveness of the paper presentation at the conference. The Karel Urbánek Best Student Paper Award consists of an SPIE citation and an honorarium. To be eligible, the leading author and presenter of the paper must be a student.

Tutorial: Introduction to Computational Imaging

Abstract: This tutorial will introduce computational imaging as a broad range of techniques in which algorithms play a major role in the final image formation process. The basic recipe for computational imaging involves coming up with a forward model that can simulate/predict what your imaging system measures. This model is computationally inverted to reconstruct the object under investigation. We will also discuss how to incorporate prior knowledge and constructs from machine learning into the computational reconstruction algorithms to improve the image reconstruction fidelity. The tutorial will include examples from computational optical imaging, such as diffusercam and diffraction tomography.

Bio: Kevin C. Zhou is a postdoctoral researcher at UC Berkeley, working with Profs. Laura Waller and Hillel Adesnik. His research is centered around developing high-throughput, data-intensive computational 3D imaging systems for a broad range of applications, with interests spanning optical coherence tomography, diffraction tomography, lidar, ptychography, nonlinear microscopy, and parallelized 3D microscopy. Kevin is a recipient of the Barry M. Goldwater Scholarship, the NSF Graduate Research Fellowship, and the Schmidt Science Fellowship.

Shades of Gray: Scientific Integrity and Research Misconduct

Title: Shades of Gray: Scientific Integrity and Research Misconduct

Presenter: Prof. Markus Raschke, Professor, Physics and JILA, University of Colorado Boulder, STROBE Director of Knowledge Transfer

Abstract: Research misconduct refers to the fabrication, falsification, or plagiarism in proposing, performing, or reviewing research or in reporting research results. However, the situation is often much less clear than these formal definitions may imply. I will discuss the background and go over a range of case studies based on over 20 years of work in different ombuds and committee roles on this subject. We will discuss distinction from research error and everything in between from questionable research practices to outright misconduct. While the general rules are clear, many challenges abound in identifying, investigating, and prosecuting research misconduct. With limited resources and multi-level conflicts of interest between perpetrators, supervisors, institutions, journals, and sponsors, best practices and procedure are still poorly implemented at many institutions. I will discuss from the many shades of gray of the subject to new rules of data and record keeping.

Speaker Bio: Markus Raschke is professor at the Department of Physics and JILA at the University of Colorado at Boulder. His research is on the development and application of nano-scale nonlinear and ultrafast spectroscopy to control the light-matter interaction on the nanoscale. These techniques allow for imaging structure and dynamics of molecular and quantum matter with nanometer spatial resolution. He received his PhD in 2000 from the Max-Planck Institute of Quantum Optics and the Technical University in Munich, Germany. Following research appointments at the University of California at Berkeley, and the Max-Born-Institute in Berlin, he became faculty member at the University of Washington in 2006, before moving to Boulder in 2010. He is fellow of the Optical Society of America, the American Physical Society, the American Association for the Advancement of Science, and the Explorers Club.

“From 3D to 2D and back again” (Prof. Psaltis) and “Volumetric printing in scattering resins” (Prof. Christophe Moser)

Title: From 3D to 2D and back again

Presenter: Prof. Demetri Psaltis, Professor of Optics and the Director of the Optics Laboratory at the Ecole Polytechnique Federale de Lausanne (EPFL)

Abstract: The prospect of massive parallelism of optics enabling fast and low energy cost operations is attracting interest for novel photonic circuits where 3-dimensional (3D) implementations have a high potential for scalability. Since the technology for data input–output channels is 2-dimensional (2D), there is an unavoidable need to take 2D-nD transformations into account. Similarly, the 3D-2D and its reverse transformations are also tackled in a variety of fields such as optical tomography, additive manufacturing, and 3D optical memories. Here, we review how these 3D-2D transformations are tackled using iterative techniques and neural networks. This high-level comparison across different, yet related fields could yield a useful perspective for 3D optical design.

Title: Volumetric printing in scattering resins

Presenter: Prof. Christophe Moser, Director of the MicroEngineering Section at the Ecole Polytechnique Federale de Lausanne (EPFL)

Abstract: 3D printing has revolutionized the manufacturing of volumetric components and structures in many areas. Several fully volumetric light-based techniques have been recently developed thanks to the advent of photocurable resins, reaching print time of few tens of seconds while keeping sub 100 um resolution. We will review a variety of materials that have been reported by several groups including ours and that includes soft cell loaded hydrogels, acrylates, glass, ceramics that have been printed with volumetric printing. However, these new approaches only work with homogeneous and relatively transparent resins.

We will show a method that considers light scattering in the resin prior to computing projection patterns. Using a tomographic volumetric printer, we experimentally demonstrate that implementation of this correction is critical when printing objects whose size exceeds the scattering mean free path.

The Swirling Spins of Hedgehogs

Though microscopes have been in use for centuries, there is still much that we cannot see at the smallest length scales. Current microscopies range from the simple optical microscopes used in high school science classes, to x-ray microscopes that can image through visibly-opaque objects, to electron microscopes that use electrons instead of light to capture images of vaccines and viruses. However, there is a great need to see beyond the static structure of an object—to be able capture how a nano- or biosystem functions in real time, or to visualize magnetic fields on nanometer scales. A team of researchers from the STROBE Center have been working together to overcome these challenges. STROBE is an NSF Science and Technology Center that is building the microscopes of tomorrow. A large multidisciplinary team from the Miao and Osher groups from UCLA, the Kapteyn-Murnane group at CU Boulder, Ezio Iacocca from CU Colorado Springs, David Shapiro and collaborators at Lawrence Berkley National Laboratory, and the Badding and Crespi groups from Pennsylvania State University. They developed and implemented a new method to use x-ray beams to capture the 3D magnetic texture in a material with very high 10-nanometer spatial resolution for the first time (published in Nature Nanotechnology, see reference below).

Hedgehogs and Anti-Hedgehogs

The team investigated a nanostructured magnetic sample, consisting of tiny spheres of nickel, only ~30nm across, connected together by slender few-nm “necks” of nickel, that together form a structure called a magnetic metalattice. This complex nanostructured magnet is expected to produce swirling magnetic fields with topological spin textures that are far more complex than in a uniform magnet. These are called 3D topological magnetic monopoles – or hedgehogs, due to their spiny shape in magnetic rotation – if the magnetic field points outward. Conversely, they can be thought of anti-hedgehogs if the magnetic field points inward. However, until recently, there was no experimental method to measure the 3D spin texture at the deep nanoscale. Using advanced algorithms to recover the image, and a microscope at the x-ray synchrotron light source at the Lawrence Berkley National Laboratory, the researchers overcame these challenges.

Imaging spin textures is extremely important, as it can help physicists to better understand magnetism at a fundamental level, and to design more energy-efficient data storage, memory, and nanodevices. Using electron microscopy, one can capture beautiful 2D images of a static spin-texture, but it is challenging to capture a full 3D image. In the past, other scientists were able to capture a 3D image at a spatial resolution of about 100 nanometers, but they had to make assumptions about the sample to extract the 3D image. With this new technique, researchers do not have to make any assumptions.

Armed with this new visualization technique, the team of researchers is excited to study spin textures further. STROBE is developing tabletop setups and helping with national facilities that can capture the static and dynamic spin texture in materials. All algorithms developed for this data analysis will be open-sourced soon. In this experiment, as with others, they found that collaboration is key for moving scientific progress forward.

Humans of JILA: Brendan McBennett

Surrounded by some of the world’s most advanced lasers, computers, and microscopes sits Brendan McBennett, a graduate student at JILA. McBennett has been working in the laboratories of JILA Fellows Margaret Murnane and Henry Kapteyn, as part of the KM group since 2019, excited to see his research advance significantly over that time. “We use ultraviolet and extreme ultraviolet (EUV) lasers to study heat flow in nanostructured materials,” McBennett states. “EUV photons have a higher photon energy that makes them insensitive to electron dynamics in most materials, combined with nanometer wavelengths. This allows them to very precisely probe surface deformations induced by heat – or thermal phonons – to capture new materials behaviors.”

Congratulations to Brendan McBennett for Being Named as the 2023 Recipient of the Nick Cobb Memorial Scholarship

Brendan McBennett has been announced as the 2023 recipient of the $10,000 Nick Cobb Memorial Scholarship by SPIE, the international society for optics and photonics, and Siemens EDA — formerly Mentor, a Siemens company — for his potential contributions to the field related to advanced lithography. McBennett will also be honored during 2023’s SPIE Advanced Lithography + Patterning conference.

The Nick Cobb scholarship recognizes an exemplary graduate student working in the field of lithography for semiconductor manufacturing. The award honors the memory of Nick Cobb, who was an SPIE Senior Member and chief engineer at Mentor. His groundbreaking contributions enabled optical and process proximity correction for IC manufacturing. Originally funded for three years ending in 2021, the Nick Cobb scholarship will be awarded to one student annually for an additional period of three years, through 2024.

Congratulations to Chen-Ting Liao for Receiving a Young Investigator Research Program Award from the Air Force Office of Scientific Research

Dr. Chen-Ting (Ting) Liao has been selected as an AFOSR Young Investigator. The Air Force Office of Scientific Research, or AFOSR, the basic research arm of the Air Force Research Laboratory, will award approximately $25 million in grants to 58 scientists and engineers from 44 research institutions and businesses in 22 states under the fiscal year 2023 Young Investigator Research Program, or YIP.

“Through the YIP, the Department of the Air Force fosters creative basic research in science and engineering, enhances early career development of outstanding young investigators and increases opportunities for the young investigators to engage in forwarding the DAF mission and related challenges in science and engineering,” said Ellen Robinson, YIP program manager.

YIP recipients receive three-year grants of up to $450,000. The program is open to U.S. citizens and permanent residents who are scientists and engineers at U.S. research institutions. Individuals must have received Ph.D. or equivalent degrees in the last seven years and show exceptional ability and promise for conducting basic research of Department of the Air Force, or DAF, relevance. Award selections are subject to successful completion of negotiations with the academic institutions and businesses.

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About Lauren Mason