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Resonantly Enhanced Hybrid Wannier-Mott-Frenkel Excitons in Organic-Inorganic Van Der Waals Heterostructures.
Adv Mater
January 2025
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China.
Hybrid excitons formed via resonant hybridization in 2D material heterostructures feature both large optical and electrical dipoles, providing a promising platform for many-body exciton physics and correlated electronic states. However, hybrid excitons at organic-inorganic interface combining the advantages of both Wannier-Mott and Frenkel excitons remain elusive. Here, hybrid excitons are reported in the copper phthalocyanine/molybdenum diselenide (CuPc/MoSe) heterostructure (HS) featuring strong molecular orientation dependence by low-temperature photoluminescence and absorption spectroscopy.
View Article and Find Full Text PDFElectronic spectroscopy and excited state mixing of OThF.
J Chem Phys
January 2025
Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Electronic spectra for OThF have been recorded using fluorescence excitation and two-photon resonantly enhanced ionization techniques. Multiple vibronic bands were observed in the 340-460 nm range. Dispersed fluorescence spectra provided ground state vibrational constants and evidence of extensive vibronic state mixing at higher excitation energies.
View Article and Find Full Text PDFEnhancing cooperativity of molecular J-aggregates by resonantly coupled dielectric metasurfaces.
Nanophotonics
August 2024
Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore 637371, Singapore.
Article Synopsis
- J-aggregates are assemblies of dyes that exhibit strong light absorption and fluorescence due to delocalized excitons, but their effectiveness is limited by local disorder and thermal decoherence.
- To enhance exciton coherence and delocalization, researchers coupled ordered molecular dipoles to an electromagnetic mode within an optical resonator.
- By using dielectric metasurfaces, the study achieved a 5-fold increase in luminescence intensity and reduced emission directivity, showcasing the potential of these surfaces in promoting cooperative behaviors in excitonic systems.
Spectral Flux Enhancement of X Rays for Addressing Ultranarrow Nuclear Transitions.
Phys Rev Lett
November 2024
Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
Article Synopsis
- Researchers successfully resonantly excited a 1.4 feV ultranarrow nuclear transition in ^{45}Sc for the first time using the EuXFEL laser, marking a significant step towards a nuclear clock.
- The experiment demonstrated the high potential of x-ray free-electron lasers but also revealed limitations due to their large spectral bandwidth of approximately 1 eV.
- To overcome this, a method is proposed that uses a resonant absorber with a frequency gradient to enhance spectral flux, potentially achieving about a hundredfold increase in efficiency for nuclear excitation in ^{45}Sc_{2}O_{3} single crystals, crucial for future nuclear clock development.
Article Synopsis
- This study compares resonant and non-resonant electro-optical modulator configurations to determine which offers the best modulation amplitude with low drive voltage and broad bandwidth.
- The ring-assisted Mach-Zehnder modulator (RaMZM) stands out for its chirp-free and enhanced modulation capabilities without bandwidth limitations, unlike the racetrack modulator (RTM) which compromises on chirp and bandwidth.
- The RaMZM is identified as a suitable option for network applications needing efficient signal encoding, demonstrated by experiments achieving high modulation rates with minimal voltage requirements.*
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