Research

In addition to teaching, the Faculty in the Department of Physics are actively engaged in the search for new knowledge and novel applications of physics. Researchers in the Department work in topics ranging from the very small (quantum systems) to the very large (space weather, astrophysics, and cosmology), from the highly theoretical (geometric algebra, many-body physics) to the very practical (photonics, vacuum physics technology, and instrumentation), and from pure hardcore physics (condensed matter physics, general relativity, and mathematical physics) to highly interdisciplinary topics (atmospheric physics, climate physics, and materials science). Listed below are the research groups in the Department:

Earth System Physics:
     •  Air Quality Group
               •  Cambaliza,  Simpas
     •  Physics of the Climate and Weather Group
               •   Narisma, Olaguera, Villarin
     •  Geophysics Group
               •  Maquiling
     •  Space Weather Group
               •  Bennett, McNamara, Sugon

Materials Science:
     •  Auxetic Materials Group
               •  Chan
     •  Materials Characterization Group
               •  Chan
     •  Thin Films and Plasma Processing Group
               •  Culaba, Delos Santos, Mahinay

Photonics:
     •  Photonics Group
               •  Guerrero

Physics Education:
     •  Physics Education Group
               •  Cambaliza, Chan, Culaba, Dailisan, Maquiling

Theoretical and Computational Physics:
     •  Geometric Algebra Group
               •  McNamara, Sugon
  
 
Some Selected Publications:

2011

Impact of Problem-Based Learning (PBL) on Student Achievement in Secondary Physics Course

By

M.L. Bergantin and J.T. Barretto, “Impact of Problem-Based Learning (PBL) on Student Achievement in Secondary Physics Course”

This paper examines the effectiveness of problem based learning in developing the problem solving skills of students. A pre-test post test control group was adopted for the study. Statistical tests on two hypotheses involving problem solving skills developed using traditional and PBL-based instruction were performed. Results showed that there is no significant difference on the problem solving skills developed using PBL and traditional methods. © 2011 Samahang Pisika ng Pilipinas

(poster, national conference)

2010

Oblique superposition of two elliptically polarized lightwaves using geometric algebra: is energy–momentum conserved?

By Sugon, Quirino Jr., McNamara, Daniel J., SJ

Michelle Wynne C. Sze, Quirino M. Sugon, Jr., and Daniel J. McNamara, “Oblique superposition of two elliptically polarized lightwaves using geometric algebra: is energy–momentum conserved?,” J. Opt. Soc. Am. A 27, 2468-2479 (2010)

Michelle Wynne C.1 Sze, Quirino M. Sugon, Jr.1,2, and Daniel J. McNamara 1,2 1 Physics Department, Ateneo de Manila University, Loyola Heights, Quezon City, Philippines 2 Manila Observatory, Ateneo de Manila University Campus, Loyola Heights, Quezon City, Philippines Physics Department, Ateneo de Manila University

In this paper, we use Clifford (geometric) algebra Cl3,0 to verify if electromagnetic energy–momentum density is still conserved for oblique superposition of two elliptically polarized plane waves with the same frequency. We show that energy–momentum conservation is valid at any time only for the superposition of two counter-propagating elliptically polarized plane waves. We show that the time-average energy–momentum of the superposition of two circularly polarized waves with opposite handedness is conserved regardless of the propagation directions of the waves. And, we show that the resulting momentum density of the superposed waves generally has a vector component perpendicular to the momentum densities of the individual waves.

Source: Optical Society of America

(journal article)

A qualitative approach to aberrations of optical elements

By

Jerry Barretto and Clark Kendrick Go, “A qualitative approach to aberrations of optical elements,” Chin. Opt. Lett. 8, 1022-1024 (2010).

A qualitative method to analyze wavefront aberrations is presented. Aberrations of the primary type, expressed in their matrix forms, are used to write the generalized ray transfer matrix of an optical component. The aberrations were treated collectively by examining the pseudospectra of an augmented matrix constructed from the aberration matrices. Results show that aberrations can be distinguished and relative strengths pronounced using this qualitative method.

Source: Optics Infobase

Using the Factor Separation Method for land-use: land-cover change impacts on weather and climate process with the Regional Atmospheric Modeling System

By Narisma, Gemma Teresa T.

Beltrán-Przekurat 1, A., R.A. Pielke Sr.1, J.L Eastman, 2, G.T. Narisma3, A.J. Pitman 4, M. Lei 5 and D. Niyogi 1 Department of Atmospheric and Oceanic Sciences and Cooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado, Boulder, CO 80309 2 WindLogics Inc., 201 4th St NW, Grand Rapids, MN 55744 3 Physics Department. Ateneo de Manila University, Loyola Heights, Quezon City, 1108, Philippines 4 Climate Change Research Centre, University of New South Wales, Sydney, NSW, 2052, Australia. 5 Purdue University, Department of Agronomy, and Department of Earth and Atmospheric Sciences, Lilly Hall of Life Sciences, 915 W. State Street, Purdue University. West Lafayette, IN 47907-2054

The use of the Factor Separation Method (FacSep) has been applied effectively in the Regional Atmospheric Modeling System (RAMS) to assess the relative contribution of different factors on weather and climate processes. In this chapter we will discuss model sensitivities to historical and future changes in land use – land cover, biophysical and radiative effects of increased CO2 concentration and land cover representation assessed using the FacSep in weather and regional climate simulations for various regions around the world. This method emphasizes the importance of land cover changes and CO2 biological effects when addressing regional-scale future climate change impacts.

Bibliographic entry: Beltrán-Przekurat, A., R.A. Pielke Sr., J.L Eastman, G.T. Narisma, A.J. Pitman, M. Lei, and D. Niyogi, 2009: Using the Factor Separation Method for land-use land-cover change impacts on weather and climate process with the Regional Atmospheric Modeling System. In: The Factor Separation Method in the Atmosphere-Applications and Future Prospects, Cambridge University Press, ISBN-13: 9780521191739.

Source: Cambridge University Press

Copper Thin Films on Plasma-treated Glass Substrates

By

P.Ramos1,2,A.Ang1, I.Culaba1 1Dept of Physics, Ateneo de Manila University 2CDCAS, Isabela State University

A vacuum coating system for thermal evaporation was reconfigured to include a DC glow discharge system for plasma bombardment of substrates before the deposition process. Cu films were deposited onto glass substrates using this modified coating system. The glass substrates where exposed to argon plasma discharge for ten minutes before copper metallization, without breaking the vacuum. It was observed that less surface imperfections and higher adhesion were manifested by the Cu films on plasma-treated glass substrates as compared to glass substrates which did not undergo plasma treatment. Higher percent transmission was achieved for thermally evaporated Cu film of 16.32% compared to PAD samples.

28th Samahang Pisika ng Pilipinas (SPP) Physics Congress at MMLDC, Antipolo City, 25-27 October 2010.

Generalized Huygens-Fresnel integral for a single small aberration

By

J.Barretto1, S.Baluyot1,2 1 Dept of Physics, Ateneo de Manila University 2 Dept .of Mathematics, Ateneo de Manila University

The generalized Huygens-Fresnel (GHF) integral is modified to take into account the effects of a single small arbitrary aberration. This is accomplished by considering the ray transfer matrix (RTM) of an optical element with aberrations as a perturbation of the RTM in the absence of aberrations. The elements of the perturbed RTM is then used to write the kernel of the GHF integral. Effects of the aberration on a gaussian beam are discussed using the complex beam parameter in the presence of aberrations.

28th Samahang Pisika ng Pilipinas (SPP) Physics Congress at MMLDC, Antipolo City, 25-27 October 2010.

Liquid-air Interface Deformation Adaptive Lens

By Guerrero, Raphael A.

J.Barretto, R.Guerrero Dept of Physics, Ateneo de Manila University

A variable focus liquid lens based on refractive imaging is presented. Deformation of the liquid interface by liquid redistribution introduces menisci in the proximity of the aperture of a reservoir. By controlled variation of the liquid volume, convex and concave lens profiles were produced. Magnification and imaging properties are presented.

28th Samahang Pisika ng Pilipinas (SPP) Physics Congress at MMLDC, Antipolo City, 25-27 October 2010.

Oblique angle deposition of high transmitting MgF2 multilayer films

By Culaba, Ivan B., Ang, Artoni Kevin R.

P.Ramos1,2, A.Ang1, I.Culaba1 1Dept of Physics, Ateneo de Manila University 2CDCAS,Isabela State University M

agnesium fluoride was deposited on glass substrates using Oblique Angle Deposition (OAD) by resistive heating. Samples were prepared by a combination of OAD and normal incidence deposition, and one sample was prepared using normal incidence deposition. Electron microscopy of the samples revealed a columnar grain structure, while EDX analysis showed unbalanced stoichiometry for samples prepared without a pore closure layer (outer-layer with deposition angle of 0°). The transmission spectra of the samples were also obtained and it was found that by changing the deposition angle of the film, the transmission properties of the samples can be manipulated.

28th Samahang Pisika ng Pilipinas (SPP) Physics Congress at MMLDC, Antipolo City, 25-27 October 2010.