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Angular Dispersion of Free-Electron-Light Coupling in an Optical Fiber-Integrated Metagrating.
ACS Photonics
March 2024
Center for Nanophotonics, NWO-Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Free electrons can couple to optical material excitations on nanometer-length and attosecond-time scales, opening-up unique opportunities for both the generation of radiation and the manipulation of the electron wave function. Here, we exploit the Smith-Purcell effect to experimentally study the coherent coupling of free electrons and light in a circular metallo-dielectric metagrating that is fabricated onto the input facet of a multimode optical fiber. Using hyperspectral angle-resolved (HSAR) far-field imaging inside a scanning electron microscope, we probe the angular dispersion of Smith-Purcell radiation (SPR) that is simultaneously generated in free space and inside the fiber by an electron beam that grazes the metagrating at a nanoscale distance.
View Article and Find Full Text PDFAn improved synthetic signal injection routine for the Haloscope At Yale Sensitive To Axion Cold dark matter (HAYSTAC).
Rev Sci Instrum
May 2023
Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
Microwave cavity haloscopes are among the most sensitive direct detection experiments searching for dark matter axions via their coupling to photons. When the power of the expected microwave signal due to axion-photon conversion is on the order of 10-24 W, having the ability to validate the detector response and analysis procedure by injecting realistic synthetic axion signals becomes helpful. Here, we present a method based on frequency hopping spread spectrum for synthesizing axion signals in a microwave cavity haloscope experiment.
View Article and Find Full Text PDFIn this study, a twisted correlated optical beam with a dark hollow center in its average intensity is synthesized by correlated correlation perturbation and incoherent mode superposition. This new hollow beam has a topological charge (TC) mode with a zero value compared with a coherence vortex that has a TC mode with a nonzero value. We transform the twisted correlated beam from solid centered to dark hollow centered by constructing a correlation between the twist factor and the spot structure parameter.
View Article and Find Full Text PDFAchievement of narrow-band blue-emitting phosphors KScSr Ca SiO:Bi by the migration of luminescence centers.
RSC Adv
March 2021
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University Baoding 071002 China +86-312-5977068.
In recent years, efforts have been made to develop narrow-band emission phosphors with excellent performance. Herein, a series of KScSr Ca SiO:0.07Bi narrow-band phosphors were synthesized by a co-substitution method, and the crystal structure, the occupancy of activated ions and luminescence properties were studied in detail.
View Article and Find Full Text PDFCentral processing of speech sounds and non-speech sounds with similar spectral distribution: An auditory evoked potential study.
Auris Nasus Larynx
October 2020
Department of Otolaryngology - Head and Neck Surgery, Iwate Medical University, 19-1, Uchimaru, Morioka, Iwate, Japan.
Objective: The purpose of this study was to measure the auditory evoked potentials for speech and non-speech sounds with similar spectral distributions.
Methods: We developed two types of sounds, comprising naturally spoken vowels (natural speech sounds) and complex synthesized sounds (synthesized sounds). Natural speech sounds consisted of 5 Japanese vowels.
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