Research
Optical Near-field effects
We study the fundamentals of optical near-field effects, i.e. Talbot, Talbot-Lau or Lau effects. Talbot and Talbot-Lau effects are frequently used in lensless imaging applications with light, ultrasound, x-rays, atoms and molecules – generally in situations where refractive optical elements are non-existent or not suitable. We perform both theoretical simulations and experiments with light, single photons, electrons, atoms, and molecules.
The main aim of this work is to investigate the fundamentals of the optical near-field effects for potential applications.
Our references:
William B. Case, Mathias Tomandl, Sarayut Deachapunya and Markus Arndt, Realization of Optical Carpets in the Talbot and Talbot-Lau Configurations, Optics Express 17(23), 20966 (2009).
Sorakrai Srisuphaphon, Sitti Buathong, Sarayut Deachapunya, Simple technique for producing a 1D periodic intensity profile with a desired open fraction for optical sensor applications, JOSA B 37, 2021 (2020).
Thanarwut Photia, Wipawee Temnuch, Sorakrai Srisuphaphon, Nuttanan Tanasanchai, Waranont Anukool, Kunaree Wongrach, Pachara Manit, Surasak Chiangga, and Sarayut Deachapunya, High-precision grating period measurement, Applied Optics 58(2), 270-273 (2019).
Wipawee Temnuch, Sarayut Deachapunya, Pituk Panthong, Surasak Chiangga, Sorakrai Srisuphaphon, A simple description of near-field and far-field diffraction, Wave Motion 78, 60-67 (2018).
Sarayut Deachapunya, Sorakrai Srisuphaphon, Pituk Panthong, Thanarwut Photia, Kitisak Boonkham, and Surasak Chiangga, Realization of the single photon Talbot effect with a spatial light modulator, Optics Express 24(18), 20029 (2016).
Thomas Juffmann, Stefan Truppe, Philipp Geyer, Andras G. Major, Sarayut Deachapunya, Hendrik Ulbricht and Markus Arndt, Wave and particle in molecular interference lithography, Phys. Rev. Lett. 103, 263601 (2009).
Sorakrai Srisuphaphon, and Sarayut Deachapunya, The study of wave motion in the Talbot interferometer with a lens, Wave Motion 56, 199-204 (2015).
Sarayut Deachapunya, and Sorakrai Srisuphaphon, Sensitivity of transverse shift inside a double-grating Talbot interferometer, Measurement 58, 1 (2014).
Sarayut Deachapunya, and Sorakrai Srisuphaphon, Accordion lattice based on the Talbot effect, Chin. Opt. Lett. 12(3), 031101 (2014).
Optical vortices
Optical vortex or phase singularity is a twisted light which contains information on the phase and orbital angular momentum (OAM) of light. Characterization of OAM states of light has been a major technical challenge over the past decade. We apply the near-field Talbot effect to distinguish, characterize, and detect optical vortices. We perform experiments with single-, double-, multiple-slit, and grating diffraction. High-contrast image detection is achieved with the Talbot effect of a grating, even for higher than l = |1| orbital angular momentum states.
We introduce a new method to identify an optical vortex beam.
Our references:
Pituk Panthong, Sorakrai Srisuphaphon, Surasak Chiangga, Sarayut Deachapunya, High-contrast optical vortex detection using the Talbot effect, Applied Optics 57(7), 1657-1661 (2018).
Pituk Panthong, Sorakrai Srisuphaphon, Apichart Pattanaporkratana, Surasak Chiangga, and Sarayut Deachapunya, A study of optical vortices with the Talbot effect, Journal of Optics 18(3), 035602 (2016).
Matter-wave interferometry
The superposition principle is one of the fascinating key features of quantum mechanics. Matter-wave interferometry is a state-of-the-art technique for testing this quantum superposition. It has been applied to more massive particles such as macromolecules, i.e. C60. Matter-wave interferometry is not only useful for studying fundamental effects of quantum physics but also for practical applications. Because of its high sensitivity to external perturbations, a matter-wave interferometer may serve for precision measurements and quantum metrology.
Here, we aim to design and construct a first matter-wave interferometer in Thailand. It will be performed with Rb cold atoms and electrons. We will apply our matter-wave interferometer for inertial force sensing applications.
Our references:
Thomas Juffmann, Stefan Truppe, Philipp Geyer, Andras G. Major, Sarayut Deachapunya, Hendrik Ulbricht and Markus Arndt, Wave and particle in molecular interference lithography, Phys. Rev. Lett. 103, 263601 (2009).
Hendrik Ulbricht, Martin Berninger, Sarayut Deachapunya, André Stefanov, and Markus Arndt, Gas phase sorting of fullerenes, polypeptides, and carbon nanotubes, Nanotechnology 19, 045502 (2008).
Sarayut Deachapunya, Paul J. Fagan, Andras G. Major, Elisabeth Reiger, Helmut Ritsch, André Stefanov, Hendrik Ulbricht, and Markus Arndt, Slow beams of massive molecules, Eur. Phys. J. D 46, 307 (2008).
Martin Berninger, André Stefanov, Sarayut Deachapunya, and Markus Arndt, Polarizability measurements of a molecule via a near-field matter-wave interferometer, Phys. Rev. A 76, 013607 (2007).
Sarayut Deachapunya, André Stefanov, Martin Berninger, Hendrik Ulbricht, Elisabeth Reiger, Nikos L. Doltsinis, and Markus Arndt, Thermal and electrical properties of porphyrin derivatives and their relevance for molecule interferometry, J. Chem. Phys. 126, 164304 (2007).