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Electromagnetically induced grating based on strongly coupled disperse red1 molecules
Authors:
Xiaotong Bu,
Jingsong Yuan,
Chunliang Wang
Abstract:
In this study, optically responsive exciton-polariton were generated via strong coupling between DR1 molecules and an F-P microcavity. An electromagnetically induced grating (EIG) was constructed using two-beam interference to investigate EP modulation effects.EP formation was confirmed by transmission spectroscopy, angle-dependent measurements, and k-space reflection. Rabi splitting increased wit…
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In this study, optically responsive exciton-polariton were generated via strong coupling between DR1 molecules and an F-P microcavity. An electromagnetically induced grating (EIG) was constructed using two-beam interference to investigate EP modulation effects.EP formation was confirmed by transmission spectroscopy, angle-dependent measurements, and k-space reflection. Rabi splitting increased with DR1 concentration, indicating enhanced light-matter interaction. Under 532 nm laser illumination, reversible Rabi splitting changes occurred: upper/lower polariton peaks shifted by 16 nm-8 nm toward the 490 nm absorption peak with a 2% transmittance increase, recovering after laser removal.Introducing EP into EIG enhanced first-order diffraction intensity by 2-10 times compared to the non-coupled state, with peak positions shifting 8-30 nm under EP regulation. Diffraction angles varied within 2°, correlating with coupling strength. Compared with the bare DR1/PMMA film, the EIG diffraction signal of the strong coupling device was 2-7 times stronger, with clearer resolution and faster optical response near the resonance position, attributed to the enhanced light-matter interaction in the EP system.
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Submitted 8 June, 2025;
originally announced June 2025.
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Isolated elliptically-polarized attosecond pulse generation in gapped graphene driven by linearly polarized laser fields
Authors:
Xinru Song,
Xiaoyu Bu,
Xiaohui Zhao,
Rongxiang Zhang,
Shang Wang,
Fulong Dong
Abstract:
We theoretically investigate high-order harmonic generation (HHG) and its ellipticity in gapped graphene, driven by a femtosecond short-pulse laser at various orientation angles, employing the two-band density-matrix equations within the tight-binding approximation. The orientation-dependent harmonic spectra exhibit pronounced enhancement of specific harmonics, which we attribute to the caustic ef…
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We theoretically investigate high-order harmonic generation (HHG) and its ellipticity in gapped graphene, driven by a femtosecond short-pulse laser at various orientation angles, employing the two-band density-matrix equations within the tight-binding approximation. The orientation-dependent harmonic spectra exhibit pronounced enhancement of specific harmonics, which we attribute to the caustic effect. Using the recombination trajectory model, we reveal that the orientation dependence of these enhanced harmonics originates from the distinct band structures encountered by electrons ionized from the two inequivalent $\textrm{K}$ points. Moreover, we focus on the ellipticity of the enhanced harmonics at specific angles and demonstrate that it primarily depends on the phase difference between the parallel and perpendicular components, which can be accurately predicted by our recombination trajectory model. Based on these insights, we propose a two-color (fundamental plus second-harmonic) field scheme to generate isolated elliptically polarized attosecond pulses (IEAPs) in gapped graphene. Our findings may provide a promising pathway toward the generation of IEAPs in gapped graphene or transition metal dichalcogenides.
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Submitted 19 May, 2025; v1 submitted 24 April, 2025;
originally announced April 2025.
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Sound insulation performance of multi-layer membrane-type acoustic metamaterials based on orthogonal experiments
Authors:
Jun Lan,
Yumin Zhou,
Xin Bu,
Yifeng Li
Abstract:
The challenge of achieving effective sound insulation using metamaterials persists in the field. In this research endeavor, a novel three-layer membrane-type acoustic metamaterial is introduced as a potential solution. Through the application of orthogonal experiments, remarkable sound insulation capabilities are demonstrated within the frequency spectrum of 100-1200 Hz. The sound insulation princ…
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The challenge of achieving effective sound insulation using metamaterials persists in the field. In this research endeavor, a novel three-layer membrane-type acoustic metamaterial is introduced as a potential solution. Through the application of orthogonal experiments, remarkable sound insulation capabilities are demonstrated within the frequency spectrum of 100-1200 Hz. The sound insulation principle of membrane-type acoustic metamaterial is obtained through the analysis of eigenmodes at the peak and trough points, combined with sound transmission loss. In addition, an orthogonal experiment is utilized to pinpoint the critical factors that impact sound insulation performance. By using relative bandwidth as the classification criterion, the optimal combination of influencing factors is determined, thereby improving the sound transmission loss of the multi-layer membrane-type acoustic metamaterial structure and broadening the sound insulation bandwidth. This study not only contributes a fresh and practical approach to insulation material design but also offers valuable insights into advancing sound insulation technology.
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Submitted 22 February, 2025;
originally announced February 2025.
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Frequency-Modulation Mode-Locked Laser with GHz Spectral Width Tunable in the 2-3 um Region
Authors:
Zheyuan Zhang,
Xiangbao Bu,
Daiki Okazaki,
Wenqing Song,
Ikki Morichika,
Satoshi Ashihara
Abstract:
A narrow-bandwidth actively mode-locked laser using a Cr:ZnS gain medium has been successfully demonstrated. A free-space electro-optic phase modulator is employed in the solid-state laser resonator to achieve frequency-modulation (FM) mode-locking, which achieves a narrow spectral width of ~1 GHz and a pulse duration of ~500 ps over a wide tuning range of 1947-2445 nm. The operation frequency of…
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A narrow-bandwidth actively mode-locked laser using a Cr:ZnS gain medium has been successfully demonstrated. A free-space electro-optic phase modulator is employed in the solid-state laser resonator to achieve frequency-modulation (FM) mode-locking, which achieves a narrow spectral width of ~1 GHz and a pulse duration of ~500 ps over a wide tuning range of 1947-2445 nm. The operation frequency of the modulator determines the repetition rate of the mode-locked pulse train and can stabilize it to millihertz-level without any additional feedback loop systems. We also study the theoretical expression of pulse duration and spectral width in a FM mode-locking in a laser cavity that contains considerable group-delay dispersion. The results indicates that larger intracavity dispersion can only stabilize the laser operation by avoiding mode switching, but also narrow the spectral width and increase the pulse duration. The proposed laser features a narrow spectral width at a desired mid-infrared wavelength and a comb-like spectral structure with stabilized longitudinal mode spacing, providing a powerful tool for sensing and control of molecules.
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Submitted 7 February, 2024;
originally announced February 2024.
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Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE) Conceptual Design Report Volume 1: The LBNF and DUNE Projects
Authors:
R. Acciarri,
M. A. Acero,
M. Adamowski,
C. Adams,
P. Adamson,
S. Adhikari,
Z. Ahmad,
C. H. Albright,
T. Alion,
E. Amador,
J. Anderson,
K. Anderson,
C. Andreopoulos,
M. Andrews,
R. Andrews,
I. Anghel,
J. d. Anjos,
A. Ankowski,
M. Antonello,
A. ArandaFernandez,
A. Ariga,
T. Ariga,
D. Aristizabal,
E. Arrieta-Diaz,
K. Aryal
, et al. (780 additional authors not shown)
Abstract:
This document presents the Conceptual Design Report (CDR) put forward by an international neutrino community to pursue the Deep Underground Neutrino Experiment at the Long-Baseline Neutrino Facility (LBNF/DUNE), a groundbreaking science experiment for long-baseline neutrino oscillation studies and for neutrino astrophysics and nucleon decay searches. The DUNE far detector will be a very large modu…
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This document presents the Conceptual Design Report (CDR) put forward by an international neutrino community to pursue the Deep Underground Neutrino Experiment at the Long-Baseline Neutrino Facility (LBNF/DUNE), a groundbreaking science experiment for long-baseline neutrino oscillation studies and for neutrino astrophysics and nucleon decay searches. The DUNE far detector will be a very large modular liquid argon time-projection chamber (LArTPC) located deep underground, coupled to the LBNF multi-megawatt wide-band neutrino beam. DUNE will also have a high-resolution and high-precision near detector.
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Submitted 20 January, 2016;
originally announced January 2016.
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First measurement of muon-neutrino disappearance in NOvA
Authors:
P. Adamson,
C. Ader,
M. Andrews,
N. Anfimov,
I. Anghel,
K. Arms,
E. Arrieta-Diaz,
A. Aurisano,
D. Ayres,
C. Backhouse,
M. Baird,
B. A. Bambah,
K. Bays,
R. Bernstein,
M. Betancourt,
V. Bhatnagar,
B. Bhuyan,
J. Bian,
K. Biery,
T. Blackburn,
V. Bocean,
D. Bogert,
A. Bolshakova,
M. Bowden,
C. Bower
, et al. (235 additional authors not shown)
Abstract:
This paper reports the first measurement using the NOvA detectors of $ν_μ$ disappearance in a $ν_μ$ beam. The analysis uses a 14 kton-equivalent exposure of $2.74 \times 10^{20}$ protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure $Δm^{2}_{32}=(2.52^{+0.20}_{-0.18})\times 10^{-3}$ eV$^{2}$ and $\sin^2θ_{23}$ in the range 0.38-0.65, both at the 68%…
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This paper reports the first measurement using the NOvA detectors of $ν_μ$ disappearance in a $ν_μ$ beam. The analysis uses a 14 kton-equivalent exposure of $2.74 \times 10^{20}$ protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure $Δm^{2}_{32}=(2.52^{+0.20}_{-0.18})\times 10^{-3}$ eV$^{2}$ and $\sin^2θ_{23}$ in the range 0.38-0.65, both at the 68% confidence level, with two statistically-degenerate best fit points at $\sin^2θ_{23} = $ 0.43 and 0.60. Results for the inverted mass hierarchy are also presented.
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Submitted 20 January, 2016; v1 submitted 19 January, 2016;
originally announced January 2016.
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First measurement of electron neutrino appearance in NOvA
Authors:
P. Adamson,
C. Ader,
M. Andrews,
N. Anfimov,
I. Anghel,
K. Arms,
E. Arrieta-Diaz,
A. Aurisano,
D. S. Ayres,
C. Backhouse,
M. Baird,
B. A. Bambah,
K. Bays,
R. Bernstein,
M. Betancourt,
V. Bhatnagar,
B. Bhuyan,
J. Bian,
K. Biery,
T. Blackburn,
V. Bocean,
D. Bogert,
A. Bolshakova,
M. Bowden,
C. Bower
, et al. (235 additional authors not shown)
Abstract:
We report results from the first search for $ν_μ\toν_e$ transitions by the NOvA experiment. In an exposure equivalent to $2.74\times10^{20}$ protons-on-target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of $0.99\pm0.11$ (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a backg…
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We report results from the first search for $ν_μ\toν_e$ transitions by the NOvA experiment. In an exposure equivalent to $2.74\times10^{20}$ protons-on-target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of $0.99\pm0.11$ (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of $1.07\pm0.14$ (syst.). The $3.3σ$ excess of events observed in the primary analysis disfavors $0.1π< δ_{CP} < 0.5π$ in the inverted mass hierarchy at the 90% C.L.
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Submitted 2 May, 2016; v1 submitted 19 January, 2016;
originally announced January 2016.
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Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE) Conceptual Design Report, Volume 4 The DUNE Detectors at LBNF
Authors:
R. Acciarri,
M. A. Acero,
M. Adamowski,
C. Adams,
P. Adamson,
S. Adhikari,
Z. Ahmad,
C. H. Albright,
T. Alion,
E. Amador,
J. Anderson,
K. Anderson,
C. Andreopoulos,
M. Andrews,
R. Andrews,
I. Anghel,
J. d. Anjos,
A. Ankowski,
M. Antonello,
A. ArandaFernandez,
A. Ariga,
T. Ariga,
D. Aristizabal,
E. Arrieta-Diaz,
K. Aryal
, et al. (779 additional authors not shown)
Abstract:
A description of the proposed detector(s) for DUNE at LBNF
A description of the proposed detector(s) for DUNE at LBNF
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Submitted 12 January, 2016;
originally announced January 2016.
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Measurement of Electron Neutrino Charged-Current Inclusive Cross Section in 1-3 GeV energy region with the NOvA Near Detector
Authors:
Xuebing Bu
Abstract:
We present a measurement of the electron neutrino charged-current inclusive cross section per nucleon with a data sample corresponding to 2.6E20 protons-on-target collected by NOvA near detector at Fermilab.
We present a measurement of the electron neutrino charged-current inclusive cross section per nucleon with a data sample corresponding to 2.6E20 protons-on-target collected by NOvA near detector at Fermilab.
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Submitted 6 January, 2016;
originally announced January 2016.
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Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE) Conceptual Design Report Volume 2: The Physics Program for DUNE at LBNF
Authors:
DUNE Collaboration,
R. Acciarri,
M. A. Acero,
M. Adamowski,
C. Adams,
P. Adamson,
S. Adhikari,
Z. Ahmad,
C. H. Albright,
T. Alion,
E. Amador,
J. Anderson,
K. Anderson,
C. Andreopoulos,
M. Andrews,
R. Andrews,
I. Anghel,
J. d. Anjos,
A. Ankowski,
M. Antonello,
A. ArandaFernandez,
A. Ariga,
T. Ariga,
D. Aristizabal,
E. Arrieta-Diaz
, et al. (780 additional authors not shown)
Abstract:
The Physics Program for the Deep Underground Neutrino Experiment (DUNE) at the Fermilab Long-Baseline Neutrino Facility (LBNF) is described.
The Physics Program for the Deep Underground Neutrino Experiment (DUNE) at the Fermilab Long-Baseline Neutrino Facility (LBNF) is described.
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Submitted 22 January, 2016; v1 submitted 18 December, 2015;
originally announced December 2015.