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Search for "saturable absorption" in Full Text gives 4 result(s) in Beilstein Journal of Nanotechnology.
A new photodetector structure based on graphene nanomeshes: an ab initio study
Beilstein J. Nanotechnol. 2020, 11, 1036–1044, doi:10.3762/bjnano.11.88
- applications possible. Saturable absorption, as a consequence of Pauli blocking and non-equilibrium carriers, results in hot luminescence that cannot be attained in conventional semiconductors. Hence, these properties make it an ideal photonic and optoelectronic material [1][2][3][4]. Photodetectors are a key
Growth dynamics and light scattering of gold nanoparticles in situ synthesized at high concentration in thin polymer films
Beilstein J. Nanotechnol. 2019, 10, 1768–1777, doi:10.3762/bjnano.10.172
- solar infrared radiation [3][4], in random lasers [5][6], in non-linear optical applications [7][8][9] and in sensors or bio-medical diagnostics [10][11][12]. More recently, nanocomposites containing AuNPs received even more attention due to their saturable absorption. Indeed, plasmonic nanocomposites
- they have large third-order nonlinearity, ultrafast time response (about picoseconds) and saturable absorption behavior [18][19]. However, light scattering at the surface of the device could be an important drawback for this application. The optical properties of NPs come from collective oscillations
- with a “classical” colloidal solution of AuNPs in a cuvette with 1 cm optical path (Figure 1). This means that the same absorbance can be obtained with a material thickness ca. 2·104 times smaller. Passive Q-switches based on saturable absorption of AuNP-doped films are usually prepared in a two-steps
Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared
Beilstein J. Nanotechnol. 2018, 9, 2730–2740, doi:10.3762/bjnano.9.255
- substrates. The ZnO NRs exhibit a broadband (1–2 µm) near-IR absorption ascribed to the singly charged zinc vacancy VZn−1. The saturable absorption of the ZnO NRs is studied at ≈1 µm under picosecond excitation, revealing a low saturation intensity, ≈10 kW/cm2, and high fraction of the saturable losses. The
- nanorods; Q-switching; saturable absorption; solid-state lasers; zinc oxide; Introduction Zinc oxide (ZnO) is a well-known II–IV group wide-bandgap semiconductor (Eg = 3.37 eV), possessing a hexagonal wurtzite-type (sp. gr. P63mc) structure with unit cell parameters a = 3.25 Å, c = 5.20 Å. In recent years
- ZnO have been demonstrated [11]. Such properties of ZnO NRs make them interesting for potential applications in lasers. Recently, a number of nanostructures exhibiting broadband linear absorption (from the visible to near-IR) and ultrafast and broadband saturable absorption have been proposed as “fast
Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses
Beilstein J. Nanotechnol. 2015, 6, 1781–1787, doi:10.3762/bjnano.6.182
- of nanoparticles to the reverse saturable absorption, when the nanoparticle were pumped by nanosecond laser pulses at a wavelength of 532 nm [36]. When the nanoparticles were pumped by femtosecond or picosecond laser pulses at wavelengths of 800 or 1064 nm, the nanoparticles exhibited self-focusing
- scattering of the laser beam was observed. Figure 4 shows the recorded Z-scan graphs of the Ag2S QDs. The laser pump energy ranged from 25 to 45 mJ. We can see that all the open-aperture Z-scan exhibit a transmission maximum at low laser energy, indicating a saturable absorption behavior. However, there is a
- dip in the center of the transmission maximum with the laser energy increasing [42]. There is also a transmission minimum at higher laser energy, indicating a reverse saturable absorption behavior [22]. The curves of the closed-aperture Z -scans show different shapes compared to the open-aperture Z
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