Far-field second-harmonic fingerprint of twinning in single ZnO rods

Liu, S. W.; Zhou, Huajun; Ricca, A.; Tian, Zheng

doi:10.1103/physrevb.77.113311

Cited by 29 publications

(28 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 Recently it has been observed that the far-field secondharmonic generation differs between twinned and twin-free ZnO rods, which is accounted for by a dipole wire model. 14 It is possible that an extension of this mechanism to difference-frequency generation may account for the present results.…”

mentioning

confidence: 52%

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Hargreaves

Lewis

2008

Applied Physics Letters

View full text Add to dashboard Cite

We have observed that the terahertz power emitted by (100) n-type InP exhibits a single maximum and a single minimum as the crystal is rotated through 360° about its surface normal. This stands in contrast to other semiconductor terahertz emitters for which two, three, or four maxima per rotation have been observed. We have investigated the terahertz emission as a function of sample doping, optical excitation fluence, and applied in-plane magnetic field. The data cannot be accounted for by bulk optical rectification. We suggest that the origin of the phenomenon may be related to crystal twinning.

show abstract

mentioning

confidence: 52%

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Hargreaves

Lewis

2008

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…To locate a single ZnO rod, we first measured the SH image by using an objective and a camera after the sample, and then carefully moved the single ZnO rod exactly at the center of the laser beam spot. 6 The objective and camera were then removed. A lens ͑⌽ = 1 in.…”

Section: Methodsmentioning

confidence: 99%

“…A lock-in amplifier and a chopper were used to enhance the signal-to-noise ratio of the detected SH radiation. 6 10% of the original fundamental laser beam passes into a reference nonlinear BBO crystal ͑␤-BaB 2 O 4 ͒ whose SH radiation is detected by another PMT ͑also connected to the lock-in am-plifier͒. This SH radiation serves as a reference in order to normalize laser intensity fluctuations from the laser.…”

Section: Methodsmentioning

confidence: 99%

Second-order susceptibilities of ZnO nanorods from forward second-harmonic scattering

Geren

Liu

Zhou

et al. 2009

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inEnhancement in the structure quality of ZnO nanorods by diluted Co dopants: Analyses via optical second harmonic generation J. Appl. Phys. 117, 084315 (2015); 10.1063/1.4913724 Near-resonant second-order nonlinear susceptibility in c-axis oriented ZnO nanorods Appl. Phys. Lett. 105, 071906 (2014); 10.1063/1.4893599Efficient second harmonic generation in ZnO nanorod arrays with broadband ultrashort pulses A forward second-harmonic scattering method for determining the second-order susceptibility coefficients of ZnO nanorods on the order of 100 nm in diameter is presented. The long coherence length and strong intensity of the forward second-harmonic signal allow for a simple theoretical model to match the experimental measurements; this results in getting accurate values for the second-order susceptibility tensors. Different signs of d 31 and d 33 are confirmed. The results also show that Kleinman's symmetry is destroyed at a near-resonant second-harmonic wavelength of 405 nm for the ZnO nanorods.

show abstract

“…In recent years, the nonlinear optical properties of ZnO nanoobjects have attracted much attention owing to their possible applications in the field of biophotonics [23][24][25]. Under the excitation of a femtosecond (fs) laser in the near infrared region, upconverted signals such as second harmonic generation (SHG) [26] and two-photon-induced luminescence (TPL) [27][28][29] can be generated in ZnO nanoobjects, making them attractive and promising candidates for bioimaging.…”

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

View full text Add to dashboard Cite

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.

show abstract

Far-field second-harmonic fingerprint of twinning in single ZnO rods

Cited by 29 publications

References 15 publications

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

Second-order susceptibilities of ZnO nanorods from forward second-harmonic scattering

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

Contact Info

Product

Resources

About