Pulsed laser desorption of alkali atoms from PDMS thin films

Brewer, Jonathan R.; Burchianti, Alessia; Marinelli, Carmela; Mariotti, E.; Moi, L.; Rubahn, K.; Rubahn, Horst‐Günter

doi:10.1016/j.apsusc.2003.12.024

Cited by 19 publications

(10 citation statements)

References 13 publications

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“…Some other experiments did not find any frequency threshold as Rb and Cs desorbed at the same time from PDMS [13], or Rb from OTS [19], in the limits of the explored frequency range. Moreover, in the case of both Rb and Cs from PDMS, a threshold at 1.38 eV could be extrapolated, but the authors claim that this result is contradicted by their observation of LIAD with longer wavelengths and by the data of [11], which provide evidence of the LIAD effect with excitation at 1.17 eV. In the last experiment, the dynamics of short pulsed laser-induced desorption of Na atoms from PDMS coated glass prism surfaces are investigated.…”

Section: Liad In Silane Compoundsmentioning

confidence: 76%

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Low Energy Atomic Photodesorption from Organic Coatings

et al. 2016

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Organic coatings have been widely used in atomic physics during the last 50 years because of their mechanical properties, allowing preservation of atomic spins after collisions. Nevertheless, this did not produce detailed insight into the characteristics of the coatings and their dynamical interaction with atomic vapors. This has changed since the 1990s, when their adsorption and desorption properties triggered a renewed interest in organic coatings. In particular, a novel class of phenomena produced by non-destructive light-induced desorption of atoms embedded in the coating surface was observed and later applied in different fields. Nowadays, low energy non-resonant atomic photodesorption from organic coatings can be considered an almost standard technique whenever large densities of atomic vapors or fast modulation of their concentration are required. In this paper, we review the steps that led to this widespread diffusion, from the preliminary observations to some of the most recent applications in fundamental and applied physics.

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Section: Liad In Silane Compoundsmentioning

confidence: 76%

“…Besides PDMS [6][7][8][9][10][11][12][13][14][15][16][17], organic films investigated so far include octamethylcyclotetrasiloxane (OCT) [18], octadecyltrichlorosilane dry film (OTS) [19] and paraffin [20,21]. Details on the preparation of different coatings are reported in [1,4,19,20].…”

Section: Introductionmentioning

confidence: 99%

Low Energy Atomic Photodesorption from Organic Coatings

et al. 2016

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“…Enhanced channel formation is achieved at 1428 fs with 13 MHz and high pulse energy. The thermal heat diffusion length L in PDMS [22] is given by L = (kt * t p ) 1/2 . L is directly proportional to pulsewidth; therefore, increasing the pulsewidth increases the active radical concentration, and its diffusion increases in radial direction due to the energy distribution.…”

Section: Resultsmentioning

confidence: 99%

Self-Enclosed Nanofiber-Reinforced PDMS Channels Using Ultrafast Laser Irradiation

Selvaraj

Tan

Venkatakrishnan

2012

J. Microelectromech. Syst.

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We report on an innovative method to fabricate selfenclosed reinforced Polydimethylsiloxane (PDMS) microchannels using femtosecond laser pulses of megahertz pulse frequency. It involves nanofibrous structure generation and site-specific curing of PDMS. The rapid curing is due to accumulated heating at repetitive irradiation and can be explained by a volume-constrained temperature rise. The proposed technique permits both reinforcement and rapid curing and is ideal for fabricating reinforced structures in microscale. No additives are used in fabricating the nanofiber-reinforced enclosed channels. Since our method does not require a mask, it is relatively cheaper and faster compared with other conventional lithography techniques.[2012-0069]

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“…In the last few years LIAD has been characterized as a function of wall temperature, desorbing light intensity and frequency and illumination time [11][12][13][14] . LIAD has been also investigated in special vacuum chambers where Time of Flight measurements have been performed with Na and Rb atoms 17,18 . From the experimental results it comes out that the adsorbing energies involved in the process are extremely low; this fact implies as previously discussed that the formation on the coating surface of a monolayer or clusters is avoided.…”

Section: Introductionmentioning

confidence: 99%

<title>Light-induced processes on atoms and clusters confined in nanoporous silica and organic films</title>

et al. 2007

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The study of light induced processes on atoms and nanoparticles confined in organic films or in dielectric structures is motivated both by fundamental interest and applications in optics and photonics. Depending on the light intensity and frequency and the kind of confinement, different processes can be activated. Among them photodesorption processes have a key role. Non thermal light induced atomic desorption has been observed from siloxane and paraffin films previously exposed to alkali vapors. This effect has been extensively investigated and used both to develop photo-atom sources and to load magneto-optical traps. Recently we observed huge photodesorption of alkali atoms embedded in nanoporous silica. In this case the atomic photodesorption causes, by properly tuning the light frequency, either formation or evaporation of clusters inside the silica matrix. Green-blue light desorbs isolated adatoms from the glass surface eventually producing clusters, whereas red-near infrared (NIR) light causes cluster evaporation due to direct excitation of surface plasmon oscillations. Green-blue light induces cluster formation taking advantage of the dense atomic vapor, which diffuses through the glass nano-cavities. Both processes are reversible and even visible to the naked eye. By alternatively illuminating the porous glass sample with blue-green and red-NIR light we demonstrate that the glass remembers the illumination sequences behaving as an effective rereadable and rewritable optical medium.

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Pulsed laser desorption of alkali atoms from PDMS thin films

Cited by 19 publications

References 13 publications

Low Energy Atomic Photodesorption from Organic Coatings

Low Energy Atomic Photodesorption from Organic Coatings

Self-Enclosed Nanofiber-Reinforced PDMS Channels Using Ultrafast Laser Irradiation

<title>Light-induced processes on atoms and clusters confined in nanoporous silica and organic films</title>

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