Ultrafast Photodoping and Plasmon Dynamics in Fluorine–Indium Codoped Cadmium Oxide Nanocrystals for All-Optical Signal Manipulation at Optical Communication Wavelengths

Kriegel, Ilka; Urso, Carmine; Viola, Daniele; Trizio, Luca De; Scotognella, Francesco; Cerullo, Giulio; Manna, Liberato

doi:10.1021/acs.jpclett.6b01904

Cited by 49 publications

(60 citation statements)

References 53 publications

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“…[109,111,112] By increasing the pump power, more electrons accumulate in the CB and a higher intensity PIA signal is detected, which blue shifts with increasing pump power. [109,112] Figure 10. Indeed, depending on the reductant chosen as sacrificial hole scavenger, a different number of CB electrons can be accumulated by photochemical oxidation, and thus is not an intrinsic property of the multiply reduced ZnO NCs themselves.…”

Section: Degenerate Doping In Metal Oxide Ncsmentioning

confidence: 99%

Plasmonic doped semiconductor nanocrystals: Properties, fabrication, applications and perspectives

2017

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production from the NIR plasmon resonance or bio-medical applications in the biological window. In 2 this review we highlight the recent advances in the synthesis of various different plasmonic semiconductor NCs with LSPRs covering the entire spectral range, from the mid-to the NIR. We focus on copper chalcogenide NCs and impurity doped metal oxide NCs as the most investigated alternatives to noble metals. We shed light on the structural changes upon LSPR tuning in vacancy doped copper chalcogenide NCs and deliver a picture for the fundamentally different mechanism of LSPR modification of impurity doped metal oxide NCs. We review on the peculiar optical properties of plasmonic degenerately doped NCs by highlighting the variety of different optical measurements and optical modeling approaches. These findings are merged in an exhaustive section on new and exciting applications based on the special characteristics that plasmonic semiconductor NCs bring along.

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Section: Degenerate Doping In Metal Oxide Ncsmentioning

confidence: 99%

Plasmonic doped semiconductor nanocrystals: Properties, fabrication, applications and perspectives

2017

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“…The plasma frequency is written as = * (17) In this expression N is the number of charges, e the electron charge, * the effective mass and the vacuum dielectric constant. For FICO, we use = 1.68 × 10 ℎ ⁄ and * = 0.43 ⁄ , a free carrier damping Γ = 0.07, and a high frequency dielectric constant, = 5.6, is taken from [33,34].…”

Section: Resultsmentioning

confidence: 99%

Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Scotognella

2020

Physica E: Low-dimensional Systems and Nanostructures

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We design photonic structures embedding different functional molecular systems of photochromic switching and lasing. We study the light absorption of two photochromic molecules and of 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) with density functional theory. For the photochromic diarylethene we derivate the refractive index with Kramers-Kronig relations and we design multilayer photonic structures alternating diarylethene with either poly vinyl carbazole or fluorine indium co-doped cadmium oxide (FICO) nanoparticlebased layers. For BSB-Cz we design a one-dimensional photonic crystal alternating BSB-Cz layers wit SiO2 layers and a microcavity embedding BSB-Cz between indium tin oxide (ITO) / FICO nanoparticle-based multilayers.

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“…oxide (FICO) nanocrystals an ultrafast modulation of the plasmon resonance has been shown after band edge excitation due to the ultrafast photodoping. 42 The authors extracted a monoexponential recovery time within several picoseconds, indicative of the recombination of electron and hole. These measurements thus detect the temporarily increased carrier density after photodoping as long as the electron is placed in the conduction band and before recombining with the excited state hole.…”

Section: Resultsmentioning

confidence: 99%

Solution processable and optically switchable 1D photonic structures

Paternò

Iseppon

D'Altri

et al. 2018

Sci Rep

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We report the first demonstration of a solution processable, optically switchable 1D photonic crystal which incorporates phototunable doped metal oxide nanocrystals. The resulting device structure shows a dual optical response with the photonic bandgap covering the visible spectral range and the plasmon resonance of the doped metal oxide the near infrared. By means of a facile photodoping process, we tuned the plasmonic response and switched effectively the optical properties of the photonic crystal, translating the effect from the near infrared to the visible. The ultrafast bandgap pumping induces a signal change in the region of the photonic stopband, with recovery times of several picoseconds, providing a step toward the ultrafast optical switching. Optical modeling uncovers the importance of a complete modeling of the variations of the dielectric function of the photodoped material, including the high frequency region of the Drude response which is responsible for the strong switching in the visible after photodoping. Our device configuration offers unprecedented tunability due to flexibility in device design, covering a wavelength range from the visible to the near infrared. Our findings indicate a new protocol to modify the optical response of photonic devices by optical triggers only.

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Ultrafast Photodoping and Plasmon Dynamics in Fluorine–Indium Codoped Cadmium Oxide Nanocrystals for All-Optical Signal Manipulation at Optical Communication Wavelengths

Cited by 49 publications

References 53 publications

Plasmonic doped semiconductor nanocrystals: Properties, fabrication, applications and perspectives

Plasmonic doped semiconductor nanocrystals: Properties, fabrication, applications and perspectives

Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Solution processable and optically switchable 1D photonic structures

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