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Broad Spectral Tuning of Ultra-Low Loss Polaritons in a van der Waals Crystal by Intercalation
Javier Taboada-Gutiérrez, Gonzalo Álvarez-Pérez, Jiahua Duan +17
Phonon polaritons (PhPs) -- light coupled to lattice vibrations -- in polar van der Waals (vdW) crystals are promising candidates for controlling the flow of energy at the nanoscal…
Computational refocusing in phase-resolved confocal microscopy
Martin Schnell, Melanie King, Sam Buercklin +3
We demonstrate numerical refocusing in coherent confocal laser scanning microscopy based on synthetic optical holography. This physics-based approach implements a computational pro…
Probing optical anapoles with fast electron beams
Carlos Maciel-Escudero, Andrew B. Yankovich, Battulga Munkhbat +5
Optical anapoles are intriguing charge-current distributions characterized by a strong suppression of electromagnetic radiation. They originate from the destructive interference of…
Dual-band coupling between nanoscale polaritons and vibrational and electronic excitations in molecules
A. Bylinkin, F. Calavalle, M. Barra-Burillo +13
Strong coupling (SC) between light and matter excitations such as excitons and molecular vibrations bear intriguing potential for controlling chemical reactivity, conductivity or p…
Negative reflection of polaritons at the nanoscale in a low-loss natural medium
Gonzalo Alvarez-Perez, Jiahua Duan, Javier Taboada-Gutierrez +10
Negative reflection occurs when light is reflected towards the same side of the normal to the boundary from which it is incident. This exotic optical phenomenon, which provides a n…
Probing the electromagnetic response of dielectric antennas by vortex electron beams
Andrea Konecna, Mikolaj K. Schmidt, Rainer Hillenbrand +1
Focused beams of electrons, which act as both sources, and sensors of electric fields, can be used to characterise the electric response of complex photonic systems by locally prob…
Real-space nanoimaging of THz polaritons in the topological insulator Bi2Se3
Shu Chen, Andrei Bylinkin, Zhengtianye Wang +6
Plasmon polaritons in topological insulators attract attention from a fundamental perspective and for potential THz photonic applications. Although polaritons have been observed by…
THz Near-Field Imaging of Extreme Subwavelength Metal Structures
Xinzhong Chen, Xiao Liu, Xiangdong Guo +15
Modern scattering-type scanning near-field optical microscopy (s-SNOM) has become an indispensable tool in material research. However, as the s-SNOM technique marches into the far-…
Enhanced Light-Matter Interaction in B-10 Monoisotopic Boron Nitride Infrared Nanoresonators
M. Autore, I. Dolado, P. Li +10
Phonon-polaritons, mixed excitations of light coupled to lattice vibrations (phonons), are emerging as a powerful platform for nanophotonic applications. This is because of their a…
Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas
Javier Martín-Sánchez, Jiahua Duan, Javier Taboada-Gutiérrez +9
Phonon polaritons (PhPs),light coupled to lattice vibrations,with in-plane hyperbolic dispersion exhibit ray-like propagation with large wavevectors and enhanced density of optical…
Planar nano-optics in anisotropic media: anomalous refraction and diffraction-free lensing of highly confined polaritons
J. Duan, G. Álvarez-Pérez, A. I. F. Tresguerres-Mata +13
As one of the most fundamental optical phenomena, refraction between isotropic media is characterized by light bending towards the normal to the boundary when passing from a low- t…
Microcavity phonon polaritons from weak to ultrastrong phonon-photon coupling
Maria Barra-Burillo, Unai Muniain, Sara Catalano +6
Strong coupling between molecular vibrations and microcavity modes has been demonstrated to modify physical and chemical properties of the molecular material. Here, we study the mu…
Amplitude- and phase-resolved nano-imaging and nano-spectroscopy of polaritons in liquid environment
Divya Virmani, Andrei Bylinkin, Irene Dolado Lopez +3
Localized and propagating polaritons allow for highly sensitive analysis of (bio)chemical substances and processes. Nanoimaging of the polaritons evanescent fields allows for criti…
Real-space observation of vibrational strong coupling between propagating phonon polaritons and organic molecules
Andrei Bylinkin, Martin Schnell, Marta Autore +10
Phonon polaritons (PPs) in van der Waals (vdW) materials can strongly enhance light-matter interactions at mid-infrared frequencies, owing to their extreme infrared field confineme…
Collective near-field coupling in infrared-phononic metasurfaces for nano-light canalization
Peining Li, Guangwei Hu, Irene Dolado +10
Polaritons, coupled excitations of photons and dipolar matter excitations, can propagate along anisotropic metasurfaces with either hyperbolic or elliptical dispersion. At the tran…
Probes for Ultrasensitive THz Nanoscopy
Curdin Maissen, Shu Chen, Elizaveta Nikulina +2
Scattering-type scanning near-field microscopy (s-SNOM) at terahertz (THz) frequencies could become a highly valuable tool for studying a variety of phenomena of both fundamental a…
Understanding the image contrast of material boundaries in IR nanoscopy reaching 5 nm spatial resolution
Stefan Mastel, Alexander A. Govyadinov, Curdin Maissen +3
Scattering-type scanning near-field optical microscopy (s-SNOM) allows for nanoscale resolved Infrared (IR) and Terahertz (THz) imaging, and thus has manifold applications ranging…
Transient vibration imaging with time-resolved synthetic holographic confocal microscopy
Martin Schnell, P. Scott Carney, Rainer Hillenbrand
We introduce a new modality for dynamic phase imaging in confocal microscopy based on synthetic optical holography. By temporal demultiplexing of the detector signal into a series…
Infrared hyperbolic metasurface based on nanostructured van der Waals materials
Peining Li, Irene Dolado, Francisco Javier Alfaro-Mozaz +7
Metasurfaces with strongly anisotropic optical properties can support deep subwavelength-scale confined electromagnetic waves (polaritons) that promise opportunities for controllin…
THz nanofocusing with cantilevered THz-resonant antenna tips
S. Mastel, M. Lundeberg, P. Alonso-Gonzalez +7
We developed THz-resonant scanning probe tips, yielding strongly enhanced and nanoscale confined THz near fields at their tip apex. The tips with length in the order of the THz wav…
Acoustic Graphene Plasmon Nanoresonators for Field Enhanced Infrared Molecular Spectroscopy
S. Chen, M. Autore, J. Li +6
Field-enhanced infrared molecular spectroscopy has been widely applied in chemical analysis, environment monitoring, and food and drug safety. The sensitivity of molecular spectros…
Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit
Marta Autore, Peining Li, Irene Dolado +10
Enhanced light-matter interactions are the basis of surface enhanced infrared absorption (SEIRA) spectroscopy, and conventionally rely on plasmonic materials and their capability t…
Experimental Verification of the Spectral Shift between Near- and Far-Field Peak Intensities of Plasmonic Nanoantennas
P. Alonso-Gonzalez, P. Albella, F. Neubrech +8
Theory predicts a distinct spectral shift between the near- and far-field optical responses of plasmonic antennas. Here we combine near-field optical microscopy and far-field spect…