High degree of polarization of the near-band-edge photoluminescence in ZnO nanowires

Jacopin, Gwenolé; Rigutti, Lorenzo; Bugallo, Andrés De Luna; Julien, F. H.; Baratto, C.; Comini, Elisabetta; Ferroni, Matteo; Tchernycheva, Maria

doi:10.1186/1556-276x-6-501

Cited by 16 publications

(24 citation statements)

References 31 publications

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“…With the rapid development of nanometer science and technology, ZnO nanoobjects in different fashions have been successfully synthesized or fabricated by various chemical or physical methods. These ZnO nanoobjects, including nanoclusters [7][8][9][10], nanowires [11][12][13][14], nanotubes [15,16], nanorods (NRs) [17][18][19], and nanoflowers [20][21][22], have received intensive and extensive studies due to their unique electric, thermotic, cytalytic, mechanical, magnetic and optical properties originating from surface effect or quantum size effect. Among these properties, the optical properties of ZnO nanowires or NRs have been the focus of many studies because this kind of nanoobjects can be easily synthesized and has potential applications in making optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Competition between second harmonic generation and two-photon-induced luminescence in single, double and multiple ZnO nanorods

Dai¹,

Zeng²,

Lan³

et al. 2013

Opt. Express

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The nonlinear optical properties of single, double and multiple ZnO nanorods (NRs) were investigated by using a focused femtosecond (fs) laser beam. The excitation wavelength of the fs laser was intentionally chosen to be 754 nm at which the energy of two photons is slightly larger than that of the exciton ground state but smaller than the bandgap energy of ZnO. Second harmonic generation (SHG) or/and two-photon-induced luminescence (TPL) were observed and their dependences on excitation density were examined. For single ZnO NRs, only SHG was observed even at the highest excitation density we used in the experiments. The situation was changed when the joint point of two ZnO NRs perpendicular to each other was excited. In this case, TPL could be detected at low excitation densities and it increased rapidly with increasing excitation density. At the highest excitation density of ~15 MW/cm(2), the intensity of the TPL became comparable to that of the SHG. For an ensemble of ZnO NRs packed closely, a rapid increase of TPL with a slope of more than 7.0 and a gradual saturation of SHG with a slope of ~0.34 were found at high excitation densities. Consequently, the nonlinear response spectrum was eventually dominated by the TPL at high excitation densities and the SHG appeared to be very weak. We interpret this phenomenon by considering both the difference in electric field distribution and the effect of heat accumulation. It is suggested that the electric field enhancement in double and multiple NRs plays a crucial role in determining the nonlinear response of the NRs. In addition, the reduction in the bandgap energy induced by the heat accumulation effect also leads to the significant change in nonlinear response. This explanation is supported by the calculation of the electric field distribution using the discrete dipole approximation method and the simulation of temperature rise in different ZnO NRs based on the finite element method.

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Section: Introductionmentioning

confidence: 99%

Competition between second harmonic generation and two-photon-induced luminescence in single, double and multiple ZnO nanorods

Dai¹,

Zeng²,

Lan³

et al. 2013

Opt. Express

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“…The optical properties of the nanowires were first studied by photoluminescence (PL) measurements on a nanowire sample performed with excitation from a frequency-tripled mode locked Ti:Sapphire laser (pulse width 130 fs; repetition rate 80 MHz) at 267 nm. The wurtzite crystalline structure gives rise to three free exciton transitions, X A , X B and X C , of which the X A and X B excitons are polarized perpendicular to the c-axis whereas the X C exciton is strongly polarized parallel to the c-axis, as confirmed by interband momentummatrix calculations [25,26]. The PL spectrum at 10K, shown in Fig.…”

mentioning

confidence: 73%

Room temperature strong coupling effects from single ZnO nanowire microcavity

Das¹,

Heo²,

Bayraktaroglu³

et al. 2012

Opt. Express

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Strong coupling effects in a dielectric microcavity with a single ZnO nanowire embedded in it have been investigated at room temperature. A large Rabi splitting of ~100 meV is obtained from the polariton dispersion and a non-linearity in the polariton emission characteristics is observed at room temperature with a low threshold of 1.63 μJ/cm(2), which corresponds to a polariton density an order of magnitude smaller than that for the Mott transition. The momentum distribution of the lower polaritons shows evidence of dynamic condensation and the absence of a relaxation bottleneck. The polariton relaxation dynamics were investigated by time-resolved measurements, which showed a progressive decrease in the polariton relaxation time with increase in polariton density.

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“…In one of the reports, the authors showed the growth of ZnO nanowires as shown in Figure 10a using Pt as catalyst [49]. The S t (660 °C) was found to be higher as compared to the one used with Au catalyst.…”

Section: Surface Morphology Investigation Of Nanowiresmentioning

confidence: 97%

Metal Oxide Nanowire Preparation and Their Integration into Chemical Sensing Devices at the SENSOR Lab in Brescia

Bertuna

Faglia

Ferroni

et al. 2017

Sensors

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Metal oxide 1D nanowires are probably the most promising structures to develop cheap stable and selective chemical sensors. The purpose of this contribution is to review almost two-decades of research activity at the Sensor Lab Brescia on their preparation during by vapor solid (n-type In2O3, ZnO), vapor liquid solid (n-type SnO2 and p-type NiO) and thermal evaporation and oxidation (n-type ZnO, WO3 and p-type CuO) methods. For each material we’ve assessed the chemical sensing performance in relation to the preparation conditions and established a rank in the detection of environmental and industrial pollutants: SnO2 nanowires were effective in DMMP detection, ZnO nanowires in NO2, acetone and ethanol detection, WO3 for ammonia and CuO for ozone.

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High degree of polarization of the near-band-edge photoluminescence in ZnO nanowires

Cited by 16 publications

References 31 publications

Competition between second harmonic generation and two-photon-induced luminescence in single, double and multiple ZnO nanorods

Competition between second harmonic generation and two-photon-induced luminescence in single, double and multiple ZnO nanorods

Room temperature strong coupling effects from single ZnO nanowire microcavity

Metal Oxide Nanowire Preparation and Their Integration into Chemical Sensing Devices at the SENSOR Lab in Brescia

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