Y. Y. Zhu

Phase-shifting error and its elimination in phase-shifting digital holography

We investigate the influence of phase-shifting error on the quality of the reconstructed image in digital holography and propose a method of error elimination for a perfect image. In this method the summation of the intensity bit errors of the reconstructed image is taken as an evaluation function for an iterative algorithm to find the exact phase-shifting value. The feasibility of this method is demonstrated by computer simulation.

Resonance transmission modes in dual-periodical dielectric multilayer films

The resonance transmission modes with high-quality factors may generate in a one-dimensional dual-periodic photonic band-gap structure. The frequency, frequency interval, and number of these modes can be tuned as desired by adjusting its structural parameters. In this letter, we report the experimental and theoretical results on dual-periodical TiO2/SiO2 multilayer films. With perfect transmission and mode controllability, this structure opens a promising way to fabricate multiwavelength filters for future dense wavelength division application.

Extraordinary optical transmission induced by excitation of a magnetic plasmon propagation mode in a diatomic chain of slit-hole resonators

In this paper, we will propose that magnetic-resonance nanostructures in a metal surface could be used to realize extraordinary optical transmission EOT. Toward this goal, we designed and fabricated a onedimensional diatomic chain of slit-hole resonator SHR. Due to the strong exchange current interaction, a type of magnetic plasmon MP propagation mode with a broad frequency bandwidth was established in this system. Apparent EOT peaks induced by the MP mode were observed in our measured spectra at infrared frequencies. The strongest EOT peak was obtained at 1.07 eV with an incident angle of 20°. The measured dependence of EOT peaks on the incident angle coincided with the theoretical results quite well. This proposed MP propagation mode in SHR structure has good potential applications in multifrequency nonlinear optical processes.

Scaling on hysteresis dispersion in ferroelectric systems

The hysteresis area as a function of frequency of the time-varying external electric field—hysteresis dispersion—for ferroelectric Pb(Zr0.52Ti0.48)O3 is measured, and the Monte-Carlo simulation on the hysteresis dispersion for a model ferroelectric lattice is performed too. We demonstrate the scaling behavior of the single-peaked hysteresis dispersion for the two ferroelectric systems, predicting a unique effective characteristic time for the domain reversal. This characteristic time shows an inversely linear dependence on the field amplitude as long as the amplitude is high enough that the reversible domain rotation response is negligible.

Simultaneous generation of red, green, and blue quasi-continuous-wave coherent radiation based on multiple quasi-phase-matched interactions from a single, aperiodically-poled LiTaO3

We report the experimental result of simultaneous generation of red, green, and blue (RGB) quasi-continuous-wave coherent radiation from a single, aperiodically poled LiTaO3 (APPLT), with a diode-pumped dual-wavelength Nd:YVO4 laser oscillating at 1064 and 1342 nm simultaneously. Red at 671 nm and blue at 447 nm were achieved by frequency doubling and tripling of a 1342-nm fundamental laser, respectively, and green at 532 nm was achieved by frequency doubling of a 1064-nm fundamental laser. The aperiodic structure provided three effective reciprocals to compensate the phase mismatches of the above three nonlinear processes at the same time. The result indicates that the APPLT may be employed to construct an all-solid-state RGB laser.

Surface plasmon polariton enhanced by optical parametric amplification in nonlinear hybrid waveguide.

We theoretically studied nonlinear interactions between surface plasmon polariton (SPP) and conventional waveguide mode in nonlinear hybrid waveguide and proposed a possible method to enhance SPP wave via optical parametric amplification (OPA). The phase matching condition of this OPA process is fulfilled by carefully tailoring the dispersions of SPP and guided mode. The influences of incident intensity and phase of guided wave on the OPA process are comprehensively analyzed. It is found that not only a strong enhancement of SPP but also modulations on this enhancement can be achieved. This result indicates potential applications in nonlinear optical integration and modulations.

Optical harmonic generation in a quasi-phase-matched three-component Fibonacci superlattice LiTaO3

Optical harmonic generation in a three-component Fibonacci optical superlattice (3CFOS) is studied experimentally. Quasi-phase-matched second-harmonic spectrum and third-harmonic generation have been measured in a LiTaO3 3CFOS. Results show that the structure of the spectrum in a 3CFOS is richer than that in a two-component Fibonacci optical superlattice. The intrinsic self-similarity is shown in its Fourier spectrum.

Efficient second-harmonic generation in nonlinear plasmonic waveguide

We theoretically studied a nonlinear optical process in a hybrid plasmonic waveguide composed of a nonlinear dielectric waveguide and a metal film with a separation of a thin air gap. Owing to the hybridization effect of guided mode and surface plasmon polariton mode, this particular waveguide is able to confine the optical-field in a deep subwavelength scale together with low propagation loss. Based on this, efficient second-harmonic generations (SHG) were revealed at the fundamental wavelength of λ=1.55 μm with good field confinement. The SHG efficiency, as well as the coupling coefficient and mode area, were analyzed and discussed in detail with respect to the structural parameters.

Piezoelectric coefficient measurement of piezoelectric thin films: an overview

An overview on the state-of-art piezoelectric measurements of thin films is given. The principles and advantages/disadvantages of the conventional techniques are discussed for piezoelectric applications. Concerning a direct measurement of piezoelectric coefficient and taking into account of 1.0-100.0 mum in film thickness, a displacement of 0.1 nm cannot be reliably detected by utilizing the reverse piezoelectric effect, unless the probes resolution reaches up to 10(-3) nm. The sensitivity of charge-integrator cannot be worse than similar to0.1 nC, typically. Such a high resolution in terms of displacement and charge may not be always reachable if the measurement is not carefully calibrated and manipulated. New demands on the techniques have been placed and a more careful selection of the techniques to be used is required

Simultaneously efficient blue and red light generations in a periodically poled LiTaO3

Generations of efficient blue light at 447 nm and red light at 671 nm were achieved by frequency doubling and tripling of a diode-pumped, Q-switched 1342 nm Nd:YVO4 laser with a periodically poled LiTaO3 (PPLT). The blue light at 447 nm was generated by sum-frequency mixing of the fundamental at 1342 nm with the generated second harmonic at 671 nm. The first-order and third-order reciprocals of the PPLT compensated the phase mismatches of second-harmonic and sum-frequency processes, respectively, making them quasiphase matched. The resulting averaged blue light power of 51 mW and red light power of 207 mW under the averaged fundamental power of 500 mW indicate that the PPLT may be used to construct an all-solid-state blue and red dual wavelength laser.