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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4518–4524

Optics InfoBase > Optics Express > Volume 20 > Issue 4 > Page 4518

Terahertz emission from Indium Oxide films grown on MgO substrates using sub-bandgap photon energy excitation

Elmer S. Estacio, Christopher T. Que, Fritz C. B. Awitan, Jan Isaac Bugante, Francesca Isabel de Vera, Jonathan Azares, Jessica Afalla, Jeffrey de Vero, Armando S. Somintac, Roland V. Sarmago, Arnel A. Salvador, Kohji Yamamoto, and Masahiko Tani  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 4518-4524 (2012)
http://dx.doi.org/10.1364/OE.20.004518


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Abstract

Indium oxide (In2O3) films grown by thermal oxidation on MgO substrates were optically excited by femtosecond laser pulses having photon energy lower than the In2O3 bandgap. Terahertz (THz) pulse emission was observed using time domain spectroscopy. Results show that THz emission saturates at an excitation fluence of ~400 nJ/cm2. Even as two-photon absorption has been excluded, the actual emission mechanism has yet to be confirmed but is currently attributed to carriers due to weak absorption from defect levels that are driven by a strain field at the interface of the substrate and the grown film.

© 2012 OSA

OCIS Codes
(310.6860) Thin films : Thin films, optical properties
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Thin Films

History
Original Manuscript: January 11, 2012
Revised Manuscript: February 2, 2012
Manuscript Accepted: February 2, 2012
Published: February 8, 2012

Citation
Elmer S. Estacio, Christopher T. Que, Fritz C. B. Awitan, Jan Isaac Bugante, Francesca Isabel de Vera, Jonathan Azares, Jessica Afalla, Jeffrey de Vero, Armando S. Somintac, Roland V. Sarmago, Arnel A. Salvador, Kohji Yamamoto, and Masahiko Tani, "Terahertz emission from Indium Oxide films grown on MgO substrates using sub-bandgap photon energy excitation," Opt. Express 20, 4518-4524 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-4518


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References

  1. P. Gu and M. Tani, “Terahertz radiation from semiconductor surfaces,” in Terahertz Optoelectronics: Topics in Applied Physics, Vol. 97, K. Sakai, ed. (Springer-Verlag, 2005).
  2. G. Diwa, A. Quema, E. Estacio, R. Pobre, H. Murakami, S. Ono, and N. Sarukura, “Photonic-crystal-fiber pigtail device integrated with lens-duct optics for terahertz radiation coupling,” Appl. Phys. Lett.87(15), 151114 (2005). [CrossRef]
  3. S. Ono, H. Murakami, A. Quema, G. Diwa, N. Sarukura, R. Nagasaka, Y. Ichikawa, H. Ogino, E. Ohshima, A. Yoshikawa, and T. Fukuda, “Generation of terahertz radiation using zinc oxide as photoconductive material excited by ultraviolet pulses,” Appl. Phys. Lett.87(26), 261112 (2005). [CrossRef]
  4. M. Girtan, G. I. Rusu, G. G. Rusu, and S. Gurlui, “Influence of oxidation conditions on the properties of indium oxide thin films,” Appl. Surf. Sci.162–163, 492–498 (2000). [CrossRef]
  5. R. L. Weiher and R. P. Ley, “Optical properties of indium oxide,” J. Appl. Phys.37(1), 299–302 (1966). [CrossRef]
  6. R. Sharma, R. S. Mane, S.-K. Min, and S.-H. Han, “Optimization of growth on In2O3 nano-spheres thin films by electrodeposition for dye-sensitized solar cells,” J. Alloy. Comp.479(1–2), 840–843 (2009). [CrossRef]
  7. G. Lavareda, C. Nunes de Carvalho, E. Fortunato, A. R. Ramos, E. Alves, O. Conde, and A. Almaral, “Transparent thin film transistors based on indium oxide semiconductor,” J. Non-Cryst. Solids352(23–25), 2311–2314 (2006).
  8. V. Smatko, V. Golovanov, C. C. Liu, A. Kiv, D. Fuks, I. Donchev, and M. Ivanovskaya, “Structural stability of In2O3 films as sensor materials,” J. Mater. Sci. Mater. Electron.21(4), 360–363 (2010). [CrossRef]
  9. K. K. Makhija, A. Ray, R. M. Patel, U. B. Trivedi, and H. N. Kapse, “Indium oxide thin film based ammonia gas and ethanol vapour sensor,” Bull. Mater. Sci.28(1), 9–17 (2005). [CrossRef]
  10. P. D. C. King, T. D. Veal, F. Fuchs, Ch. Y. Wang, D. J. Payne, A. Bourlange, H. Zhang, G. R. Bell, V. Cimalla, O. Ambacher, R. G. Egdell, F. Bechstedt, and C. F. McConville, “Band gap, electronic structure, and surface electron accumulation of cubic and rhombohedral In2O3,” Phys. Rev. B79(20), 205211 (2009). [CrossRef]
  11. T. Veal, P. King, C. McConville, D. Payne, A. Bourlange, and R. Egdell, “Transparent oxides: MBE unmasks the real indium oxide,” Compound Semicon.14(11), 27 (2008).
  12. P. Erhart, A. Klein, R. Egdell, and K. Albe, “Band structure of indium oxide: Indirect versus direct band gap,” Phys. Rev. B75(15), 153205 (2007). [CrossRef]
  13. R. Ascázubi, I. Wilke, K. Denniston, H. Lu, and W. J. Schaff, “Terahertz emission by InN,” Appl. Phys. Lett.84(23), 4810–4812 (2004). [CrossRef]
  14. N. Sarukura, H. Ohtake, S. Izumida, and Z. Liu, “High average-power THz radiation from femtosecond laser-irradiated InAs in a magnetic field and its elliptical polarization characteristics,” J. Appl. Phys.84(1), 654–656 (1998). [CrossRef]
  15. H. Sieber, St. Senz, and D. Hesse, “Crystallographic orientation and morphology of epitaxial In2O3 thin films grown on MgO(001) single crystal substrates,” Thin Solid Films303(1–2), 216–221 (1997).
  16. M. Nakajima, K. Uchida, M. Tani, and M. Hangyo, “Strong enhancement of terahertz radiation from semiconductor surfaces using MgO hemispherical lens coupler,” Appl. Phys. Lett.85(2), 191–193 (2004). [CrossRef]
  17. M. S. Lee, W. C. Choi, E. K. Kim, C. K. Kim, and S.-K. Min, “Characterization of the oxidized indium thin films with thermal oxidation,” Thin Solid Films279(1–2), 1–3 (1996).
  18. V. L. Malevich, R. Adomavičius, and A. Krotkus, “THz emission from semiconductor surfaces,” C. R. Phys.9(2), 130–141 (2008). [CrossRef]
  19. J. F. Holzman and A. Y. Elezzabi, “Two-photon photoconductive terahertz generation in ZnSe,” Appl. Phys. Lett.83(14), 2967–2969 (2003). [CrossRef]
  20. C. Soci and D. Moses, “Terahertz generation from poly(p-phenylene vinylene) photoconductive antenna,” Synth. Met.139(3), 815–817 (2003). [CrossRef]
  21. B. B. Hu, X.-C. Zhang, and D. H. Auston, “Terahertz radiation induced by subband-gap femtosecond optical excitation of GaAs,” Phys. Rev. Lett.67(19), 2709–2712 (1991). [CrossRef] [PubMed]
  22. J. H. Strait, P. A. George, J. Dawlaty, S. Shivaraman, M. Chandrashekhar, F. Rana, and M. G. Spencer, “Emission of terahertz radiation from SiC,” Appl. Phys. Lett.95(5), 051912 (2009). [CrossRef]
  23. T. J. Carrig, G. Rodriguez, T. S. Clement, A. J. Taylor, and K. R. Stewart, “Scaling of terahertz radiation via optical rectification in electro-optic crystals,” Appl. Phys. Lett.66(2), 121–123 (1995). [CrossRef]
  24. M. Kumar, V. N. Singh, F. Singh, K. V. Lakshmi, B. R. Mehta, and J. P. Singh, “On the origin of photoluminescence in indium oxide octahedron structures,” Appl. Phys. Lett.92(17), 171907 (2008). [CrossRef]
  25. A. Othonos, M. Zervos, and D. Tsokkou, “Femtosecond carrier dynamics in In2O3 nanocrystals,” Nanoscale Res. Lett.4(6), 526–531 (2009). [CrossRef] [PubMed]
  26. E. Estacio, M. H. Pham, S. Takatori, M. Cadatal-Raduban, T. Nakazato, T. Shimizu, N. Sarukura, A. Somintac, M. Defensor, F. C. B. Awitan, R. B. Jaculbia, A. Salvador, and A. Garcia, “Strong enhancement of terahertz emission from GaAs in InAs/GaAs quantum dot structures,” Appl. Phys. Lett.94(23), 232104 (2009). [CrossRef]
  27. K. Hess, Advanced Theory of Semiconductor Devices (Wiley Interscience, 2000).

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