Journal: Nature Photonics

Abbreviation

Nat. Photon.

Publisher

Nature

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ISSN

1749-4885
1749-4893

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Publications1 - 10 of 70
  • Coherent terahertz control of antiferromagnetic spin waves
    Item type: Journal Article
    Kampfrath, Tobias; Sell, Alexander; Klatt, Gregor; et al. (2011)
    Nature Photonics
  • Vertically emitting microdisk lasers
    Item type: Journal Article
    Mahler, Lukas; Tredicucci, Alessandro; Beltram, Fabio; et al. (2009)
    Nature Photonics
  • Quasi-periodic distributed feedback laser
    Item type: Other Journal Item
    Mahler, Lukas; Tredicucci, Alessandro; Beltram, Fabio; et al. (2010)
    Nature Photonics
  • Single-photon superabsorption in CsPbBr$_3$ perovskite quantum dots
    Item type: Journal Article
    Böhme, Simon Christian; Nguyen, Tan P.T.; Zhu, Chenglian; et al. (2025)
    Nature Photonics
    The absorption of light via interband optical transitions plays a key role in nature and applied technology, enabling efficient photosynthesis and photovoltaic cells, fast photodetectors or sensitive (quantum) light-matter interfaces. In many such photonic systems, enhancing the light absorption strength would be beneficial for yielding higher device efficiency and enhanced speed or sensitivity. So far, however, cavity-free light absorbers feature poorly engineerable absorption rates, consistent with the notion that the coupling strength between the initial and final states is an intrinsic material parameter. By contrast, greatly enhanced absorption rates had been theoretically predicted for superradiant systems, which feature giant oscillator strength through spatially extended coherent oscillations of the electron polarization. Unlike for emission processes, however, experimental realizations of superradiance in absorption-'superabsorption'-remain sparse and require complicated excited-state engineering approaches. Here we report superabsorption by the time reversal of single-photon superradiance in large CsPbBr3 perovskite quantum dots. Optical spectroscopy reveals a bandgap absorption that strongly increases with the quantum dot volume, consistent with a giant exciton wavefunction. Configuration-interaction calculations, quantitatively agreeing with the experiment, attribute the observed single-photon superabsorption to strong electron-hole pair-state correlations. The approach brings new opportunities for the development of more efficient optoelectronic devices and quantum light-matter interfaces.
  • High-speed plasmonic phase modulators
    Item type: Journal Article
    Melikyan, Argishti; Alloatti, Luca; Muslija, Alban; et al. (2014)
    Nature Photonics
  • Strongly correlated photons on a chip
    Item type: Journal Article
    Reinhard, Andreas; Volz, Thomas; Winger, Martin; et al. (2012)
    Nature Photonics
  • Integrated photodetectors for compact Fourier-transform waveguide spectrometers
    Item type: Journal Article
    Grotevent, Matthias J.; Yakunin, Sergii; Bachmann, Dominik; et al. (2023)
    Nature Photonics
    A Fourier-transform waveguide spectrometer is demonstrated by using HgTe-quantum-dot-based photoconductors with a spectral response up to a wavelength of 2 mu m. The spectral resolution is 50 cm(-1). The total active spectrometer volume is below 100 mu m x 100 mu m x 100 mu m. Extreme miniaturization of infrared spectrometers is critical for their integration into next-generation consumer electronics, wearables and ultrasmall satellites. In the infrared, there is a necessary compromise between high spectral bandwidth and high spectral resolution when miniaturizing dispersive elements, narrow band-pass filters and reconstructive spectrometers. Fourier-transform spectrometers are known for their large bandwidth and high spectral resolution in the infrared; however, they have not been fully miniaturized. Waveguide-based Fourier-transform spectrometers offer a low device footprint, but rely on an external imaging sensor such as bulky and expensive InGaAs cameras. Here we demonstrate a proof-of-concept miniaturized Fourier-transform waveguide spectrometer that incorporates a subwavelength and complementary-metal-oxide-semiconductor-compatible colloidal quantum dot photodetector as a light sensor. The resulting spectrometer exhibits a large spectral bandwidth and moderate spectral resolution of 50 cm(-1) at a total active spectrometer volume below 100 mu m x 100 mu m x 100 mu m. This ultracompact spectrometer design allows the integration of optical/analytical measurement instruments into consumer electronics and space devices.
  • Electro-optically tunable microring resonators in lithium niobate
    Item type: Journal Article
    Guarino, Andrea; Poberaj, Gorazd; Rezzonico, Daniele; et al. (2007)
    Nature Photonics
    Optical microresonators have recently attracted growing attention in the photonics community1. Their applications range from quantum electrodynamics to sensors and filtering devices for optical telecommunication systems, where they will probably become an essential building block2. Integration of nonlinear and electro–optical properties in resonators represents a very stimulating challenge, as it would incorporate new and more advanced functionality. Lithium niobate is an excellent candidate material, being an established choice for electro–optic and nonlinear optical applications. Here we report on the first realization of optical microring resonators in submicrometre thin films of lithium niobate. High-index-contrast films are produced by an improved crystal-ion-slicing and bonding technique using benzocyclobutene. The rings have radius R = 100 µm, and their transmission spectrum has been tuned using the electro–optic effect. These results open new possibilities for the use of lithium niobate in chip-scale integrated optical devices and nonlinear optical microcavities.
  • Multi-plateau high-harmonic generation in liquids driven by off-site recombination
    Item type: Journal Article
    Mondal, Angana; Neufeld, Ofer; Balciunas, Tadas; et al. (2025)
    Nature Photonics
    Non-perturbative high-harmonic generation has recently been observed in the liquid phase, and the underlying mechanism was shown to be different from that in gases and solids. Liquid-phase high-harmonic generation is currently understood in terms of a recollision mechanism with electron trajectories limited by electron scattering. The cut-off energy and its independence of the driving laser parameters are reproduced by this mechanism. However, when the driving laser intensity is increased, no extension of the cut-off energy is observed, which contrasts with the general expectations from most nonlinear media. Here we observe the appearance of a second plateau in high-harmonic generation from multiple liquids (water, heavy water, propanol and ethanol) and explore its origin. From the combined analysis of experimental, computational and theoretical results, we find that electrons recombining at neighbouring molecular sites instead of the ionization site are responsible and verify this feature through the characteristic dependence of the second-plateau yield on the ellipticity of the driving field. We find that the second plateau is dominated by electrons recombining at the first or second solvation shell, relying on hole delocalization. Theoretical results predict the appearance of yet higher plateaus, indicating a general trend. Our work establishes a previously unexplored physical phenomenon in the highly nonlinear optical response of liquid.
  • Retracted: Polarization-entangled photons produced with high-symmetry site-controlled quantum dots
    Item type: Journal Article
    Mohan, Arun; Felici, Marco; Gallo, Pascal; et al. (2010)
    Nature Photonics
Publications1 - 10 of 70