Article
Chemistry, Multidisciplinary
Andrea Konecna, Fadil Iyikanat, F. Javier Garcia de Abajo
Summary: The study demonstrates the possibility of identifying single isotope atom impurities in a nanostructure using transmission electron microscopy and spectroscopy. It shows the superior spatial resolution and ability to probe complete sets of vibrational modes by electron beams compared to conventional far-field spectroscopy.
Article
Chemistry, Multidisciplinary
Hongbin Yang, Andrea Konecna, Xianghan Xu, Sang-Wook Cheong, Eric Garfunkel, F. Javier Garcia de Abajo, Philip E. Batson
Summary: This study demonstrates the existence of relatively long-lived plasmons supported by high-mobility charge carriers in La-doped BaSnO3. The properties of infrared localized surface plasmons in BLSO nanoparticles are systematically investigated using electron energy-loss spectroscopy. The results show that LSPs in BLSO exhibit a high degree of spatial confinement compared to noble metals, and have relatively low losses and high quality factors. Further analysis clarifies the relation between plasmon damping and carrier mobility in BLSO.
Article
Multidisciplinary Sciences
Yves Auad, Eduardo J. C. Dias, Marcel Tence, Jean-Denis Blazit, Xiaoyan Li, Luiz Fernando Zagonel, Odile Stephan, Luiz H. G. Tizei, F. Javier Garcia de Abajo, Mathieu Kociak
Summary: The authors propose a technique that combines free-space light and electron beams to achieve unmatched spatial and spectral resolution. This approach allows detailed investigation of photonic structures, promising advancements in microscopy and quantum optics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Francisco Lagunas, Grant Alexander, Adriana Lee Punaro, Christian Moscosa, Linhua Hu, Jordi Cabana, Robert F. Klie
Summary: Mg batteries hold potential for high energy density rechargeable energy storage devices, but the lack of cathode materials that can efficiently de/insert Mg(2+) hinders their development. Despite promising predictions, experimental systems have not been able to compete with available Li-ion technologies. This highlights the need for fundamental studies on Mg electrochemistry.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Physics, Multidisciplinary
F. Javier Garcia de Abajo, Eduardo J. C. Dias, Valerio Di Giulio
Summary: This study reveals the nonlinear and recoil effects in the interaction between individual low-energy electrons and samples with a discrete number of states. The research highlights the potential of free electrons to control localized excitations and delineates the boundaries of such control.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Juri Barthel, Leslie J. Allen
Summary: This paper discusses the impact of ionization on imaging and spectroscopy based on phonon excitation, pointing out that in addition to elastic scattering and inelastic scattering due to phonon excitation, plasmon excitation and single electron excitation also play a role. It also suggests implications for phonon spectroscopy with a forward direction detector.
Article
Optics
Yiqi Hu, Lifeng Liu, Shicheng Zhang, Xiaolin Li, Jun Qian, Gongwei Lin, Yueping Niu, Shangqing Gong
Summary: A high-performance magnetic-free optical isolator has been achieved with more than 30 dB maximum isolation, 0.07 dB insertion loss, and continuous tunability over 1.2 GHz, offering potential for integrated optics and quantum network applications.
OPTICS COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Sandhya Susarla, Pablo Garcia-Fernandez, Colin Ophus, Sujit Das, Pablo Aguado-Puente, Margaret McCarter, Peter Ercius, Lane W. Martin, Ramamoorthy Ramesh, Javier Junquera
Summary: This research utilizes a combination of techniques to probe the electronic structure within polar vortices in oxide superlattices at the atomic scale, finding that the peaks in Ti L-edge spectra systematically shift depending on the position of the Ti4+ cations. First-principles computations and simulations derived from first principles show good agreement with experimental results.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Agust Olafsson, Siamak Khorasani, Jacob A. Busche, Jose J. Araujo, Juan Carlos Idrobo, Daniel R. Gamelin, David J. Masiello, Jon P. Camden
Summary: This study investigates the performance of carrier-doped semiconductor nanocrystals in the infrared spectrum, revealing that ITO NCs may have greater coupling strength than expected, with the potential for near-field enhancement and resonant energy transfer.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Analytical
Hyun-Gue Hong, Sang Eon Park, Sang-Bum Lee, Myoung-Sun Heo, Jongcheol Park, Tae Hyun Kim, Hee Yeon Kim, Taeg Yong Kwon
Summary: The chip-scale atomic magnetometer based on coherent population trapping demonstrated high sensitivity near zero magnetic field and in low magnetic field environments. The device showed promise for integrated atomic magnetometers with a wide operating range, providing a noise floor comparable to conventional finite-field measurements.
Article
Physics, Condensed Matter
H. Sharona, U. Bhat
Summary: In recent years, two-dimensional transition metal dichalcogenide alloys have become a research hotspot, showing rich variations in optical excitations. Experimental and theoretical studies have revealed diverse electronic structures and bandgap properties in these alloys, which may have potential applications in various electronic and optoelectronic devices.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Mechanics
Sihan Fang, Xin Lin, Hui Zeng, Xingying Zhu, Fa Zhou, Junna Yang, Fei Li, Dongbin Ou, Xilong Yu
Summary: This study proposes an optical diagnostic method based on optical emission spectroscopy and laser absorption spectroscopy to investigate gas-surface interactions within the boundary layer. The results show that this method is reliable for deep investigation of gas-surface interactions in harsh aerothermal environments.
Article
Multidisciplinary Sciences
Xiaoyan Li, Georg Haberfehlner, Ulrich Hohenester, Odile Stephan, Gerald Kothleitner, Mathieu Kociak
Summary: Surface phonon polaritons (SPhPs) are coupled photon-phonon excitations that strongly influence the optical and thermal behavior of nanomaterials. By using a scanning transmission electron microscope with a highly monochromated electron beam, varying SPhP signatures from nanoscale MgO cubes can be visualized and used to tomographically reconstruct the phononic surface electromagnetic fields of the object. This 3D information offers insights into nanoscale physical phenomena and is valuable for the design and optimization of nanostructures for new uses.
Article
Materials Science, Multidisciplinary
Kishan S. Menghrajani, Mingzhou Chen, Kishan Dholakia, William L. Barnes
Summary: Raman spectroscopy is a powerful technique for fingerprinting materials and molecules, but fluorescence interference is a common issue. Wavelength-modulated Raman spectroscopy can reduce fluorescence background, allowing clear recording of desired Raman signals. While studying vibrational strong coupling, advantages of the wavelength-modulated Raman approach are found, but results on strong coupling remain inconclusive, calling for further research.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Andres Montoya-Castillo, Michael S. Chen, Sumana L. Raj, Kenneth A. Jung, Kasper S. Kjaer, Tobias Morawietz, Kelly J. Gaffney, Tim B. van Driel, Thomas E. Markland
Summary: Time-resolved scattering experiments can image materials at the molecular scale with femtosecond time resolution. However, there are limitations in disordered media. In this study, a theoretical framework is introduced to predict and interpret experiments combining optically induced anisotropy and time-resolved scattering, and its accuracy is verified through chloroform experiments and simulations.
PHYSICAL REVIEW LETTERS
(2022)