Ultrafast Laser Ablation and Deposition of Wide Band Gap Semiconductors

Sanz, Mikel; López-Arias, M.; Marco, José F.; Nalda, R. de; Amoruso, S.; Ausanio, G.; Lettieri, S.; Bruzzese, R.; Wang, X.; Castillejo, Marta

doi:10.1021/jp108489k

Cited by 38 publications

(34 citation statements)

References 53 publications

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“…Zinc sulphide and cadmium sulphide are among the widely studied II -VI group semiconductors because they show significant quantum confinement effects which influence their electrical and optical properties [1,2]. They have found applications particularly in photovoltaic, photonic, and optoelectronic devices and sensors [3].…”

Section: Introductionmentioning

confidence: 99%

Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate

2014

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Nanoparticles of CdS and ZnS were produced by a nanosecond laser using zinc (II) and cadmium (II) complexes of ethyl xanthate. Laser pulses with a peak wavelength of 355 nm, pulse repetition rate of 10 Hz, and pulse duration of ~ 4 ns were used. The sample exposure times were 10 min and 30 min respectively. The obtained nanoparticles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-vis) and photoluminescence (PL) spectroscopy. The morphology and optical property of the synthesized nanoparticles were investigated as a function of the time of exposure. Upon extensive irradiation, the crystallinity of the CdS nanoparticles increased while the crystallinity of the ZnS nanoparticles decreased. The average crystallite size of the CdS nanoparticles estimated from the TEM image was 4.8 nm, while the presence of aggregates with no crystalline edges impeded the size determination of the ZnS nanoparticles. The absorption spectra showed that the nanoparticles exhibit quantum confinement.

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Section: Introductionmentioning

confidence: 99%

Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate

2014

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“…In both ns and ps cases, these results give insight on the nature of the nonlinear emitters responsible for HG, although more definitive conclusions will be drawn by studies in progress to characterize the cluster and nanoparticle content of the metal ablation plumes by time-of-flight mass spectrometry and by analysis of the plume material deposited on a substrate placed in the proximity of the target. 25,26 …”

Section: Resultsmentioning

confidence: 99%

Low-order harmonic generation in metal ablation plasmas in nanosecond and picosecond laser regimes

López-Arias¹,

Oujja²,

Sanz³

et al. 2012

Journal of Applied Physics

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Low-order harmonics, 3rd and 5th, of IR (1064 nm) laser emission have been produced in laser ablation plasmas of the metals manganese, copper and silver. The harmonics were generated in a process triggered by laser ablation followed by frequency upconversion of a fundamental laser beam that propagates parallel to the target surface.These studies were carried out in two temporal regimes by creating the ablation plasma using either nanosecond or picosecond pulses and then probing the plasma plume with pulses of the same duration. The spatiotemporal behaviour of the generated harmonics was characterized and reveals the distinct composition and dynamics of the plasma species that act as nonlinear media, allowing the comparison of different processes that control the generation efficiency. These results serve to guide the choice of laser ablation plasmas to be used for efficient high harmonic generation of laser radiation. 2 I INTRODUCTIONHarmonic generation (HG) of intense laser pulses in isotropic media such as gases and vapours serves to create coherent radiation in the short wavelength range of the spectrum down to the extreme ultraviolet (XUV) and X-ray regions. Low-order frequency up conversion using laser pulses of nanosecond (ns) duration have provided table-top vacuum ultraviolet (VUV) coherent light for spectroscopy and molecular photodissociation studies. 1,2 On the other hand, high-order harmonic generation 3 (HHG) requires pulses of higher intensities (typically 10 14 -10 15 W/cm 2 ) which can easily be achieved with femtosecond (fs) driving lasers. Although the phenomenon of HG is universal and can be generalized to any material with sufficient non linear response, mostly atomic, 4,5 or in some cases, molecular 6,7 gas jets have been investigated as nonlinear media. In practical applications of coherent short wavelength HG sources, a high conversion efficiency and thus high photon flux of the harmonic radiation are essential.Since the beginning of the nineties, ions generated in laser ablation plasmas have been investigated as alternative isotropic media for HHG. [8][9][10][11][12] The higher ionization potentials of ions as compared with neutral noble gas atoms would result in the extension of the harmonic cutoff towards shorter wavelengths. However, those experiments have shown that ionization-induced defocusing of the fundamental laser beam plays a detrimental effect on the HHG process.Together with atomic ions and neutrals, laser ablation can easily generate other species, such as aggregates, clusters and nanoparticles, with various nonlinear optical properties and a relative abundance that can in principle be controlled by the right choice of solid target and laser wavelength and pulse duration. Akiyama et al 9 noted that control of limiting factors (self-defocusing and wave phase mismatch between the harmonics and the radiation being converted) leads to efficient HHG in alkali ions generated by laser 3 ablation. In the last few years more research has demonstrated the advantages of usin...

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“…expansion of any trapped gas pockets, just below the surface, and forcible ejection of the surface material. 10 Then, although the target is continuously rotated and linearly translated to avoid cratering, the fabrication of thicker deposits and, in particular, of 20 nm thick gold layers results in some defects on the target surface, possibly enhancing production of aggregates.…”

Section: Discussionmentioning

confidence: 99%

“…Pulsed laser deposition (PLD) has emerged as an attractive technique for the fabrication of well-defined nanostructures and surface morphologies of various materials because of the ability to control the dimensions and the crystalline phase by varying the laser parameters and the deposition conditions. [8][9][10][11][12][13] This technique also offers the capability for producing epitaxial growth, and it has extensively been applied to produce metal nanoparticles. 14 Mechanical biosensors are based on the principle that molecular recognition on the surface of a bio-functionalized micromechanical system (e.g., a cantilever) can result in a bending (deflection) of a few nanometers.…”

Section: Introductionmentioning

confidence: 99%

Gold coating of micromechanical DNA biosensors by pulsed laser deposition

Rebollar

Sanz

Esteves³

et al. 2012

Journal of Applied Physics

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Low-temperature indium-bonded alkali vapor cell for chip-scale atomic clocks J. Appl. Phys. 113, 064501 (2013) Multi-layered dielectric cladding plasmonic microdisk resonator filter and coupler Phys. Plasmas 20, 020701 (2013) Micromachined piezoelectric microphones with in-plane directivity Appl. Phys. Lett. 102, 054109 (2013) Referee acknowledgment for 2012 Biomicrofluidics 7, 010201 (2013) Introducing a well-ordered volume porosity in 3-dimensional gold microcantilevers Appl. Phys. Lett. 102, 053501 (2013) Additional information on J. Appl. Phys. In this work, we describe the gold-coating of silicon microcantilever sensors by pulsed laser deposition (PLD) and their performance as DNA biosensors. To test optimum deposition conditions for coating the sensors, silicon substrates were gold coated by PLD using the fifth harmonic of a Nd:YAG laser (213 nm, pulse duration 15 ns). The gold deposits were characterized by atomic force microscopy and x-ray diffraction. The adequate conditions were selected for coating the sensors with a 20 nm thick gold layer and subsequently functionalized with a selfassembled monolayer of thiolated DNA. To verify PLD as a tool for gold coating of biomechanical sensors, they were characterized by using a scanning laser analyzer platform. Characterization consisted in the measurement of the differential stress of the cantilevers upon hydration forces before and after functionalization with a double-stranded DNA monolayer. The measurements showed that the sensor surface stress induced by the adsorption of water molecules is approximately seven times higher than that of functionalized sensors gold coated by thermal evaporation. These results indicate that gold coating by PLD could be an advantageous method to enhance the response of biomechanical sensors based on gold-thiol chemistry. V C 2012 American Institute of Physics. [http://dx

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Ultrafast Laser Ablation and Deposition of Wide Band Gap Semiconductors

Cited by 38 publications

References 53 publications

Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate

Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate

Low-order harmonic generation in metal ablation plasmas in nanosecond and picosecond laser regimes

Gold coating of micromechanical DNA biosensors by pulsed laser deposition

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