We report the photoluminescence (PL) investigations of quasi-whispering gallery mode (quasi-WGM) polaritons in a ZnO microrod at room temperature. By using the confocal micro-PL spectroscopic technique, we observe the clear optical quasi-WGMs. These quasi-WGMs appeared in the ultraviolet (UV) emission region where the cavity modes strongly couple with excitons and form polaritons. The quasi-WGMs polaritons can be well described by the plane wave interference and the coupling oscillator model.

© 2010 OSA

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IEEE J. Sel. Top. Quantum Electron.

• C. Li, L. Zhou, S. Zheng, and A. W. Poon, “Silicon Polygonal Microdisk Resonators,” IEEE J. Sel. Top. Quantum Electron. 12(6), 1438–1449 (2006). [CrossRef]

IEEE Photon. Technol. Lett.

• N. Ma, C. Li, and A. W. Poon, “Laterally Coupled Hexagonal Micropillar Resonator Add-Drop Filters in Silicon Nitride,” IEEE Photon. Technol. Lett. 16(11), 2487–2489 (2004). [CrossRef]

J. Appl. Phys.

• D. Wang, H. W. Seo, C.-C. Tin, M. J. Bozack, J. R. Williams, M. Park, and Y. Tzeng, “Lasing in whispering gallery mode in ZnO nanonails,” J. Appl. Phys. 99(9), 093112 (2006). [CrossRef]

Mater. Lett.

• K. Yu, Y. Zhang, R. Xu, S. Ouyang, D. Li, L. Luo, Z. Zhu, J. Ma, S. Xie, S. Han, and H. Geng, “Efficient field emission from tetrapod-like zinc oxide nanoneedles,” Mater. Lett. 59(14-15), 1866–1870 (2005). [CrossRef]

Nature

• J. Kasprzak, M. Richard, S. Kundermann, A. Baas, P. Jeambrun, J. M. J. Keeling, F. M. Marchetti, M. H. Szymańska, R. André, J. L. Staehli, V. Savona, P. B. Littlewood, B. Deveaud, and S. Dang, “Bose-Einstein condensation of exciton polaritons,” Nature 443(7110), 409–414 (2006). [CrossRef] [PubMed]

Opt. Express

• Y.-D. Yang, Y.-Z. Huang, W.-H. Guo, Q. Lu, and J. F. Donegan, “Enhancement of quality factor for TE whispering-gallery modes in microcylinder resonators,” Opt. Express 18(12), 13057–13062 (2010). [CrossRef] [PubMed]

Phys. Rev. A

• J. Wiersig, “Hexagonal dielectric resonators and microcrystal lasers,” Phys. Rev. A 67(2), 023807 (2003). [CrossRef]

Phys. Rev. B

• D. C. Reynolds, D. C. Look, B. Jogai, C. W. Litton, G. Cantwell, and W. C. Harsch, “Valence-band ordering in ZnO,” Phys. Rev. B 60(4), 2340–2344 (1999). [CrossRef]
• J. Lagois, “Depth-dependent egienenergies and damping of excitonic polaritons near a semiconductor surface,” Phys. Rev. B 23(10), 5511–5520 (1981). [CrossRef]

Phys. Rev. Lett.

• L. K. van Vugt, S. Rühle, P. Ravindran, H. C. Gerritsen, L. Kuipers, and D. Vanmaekelbergh, “Exciton polaritons confined in a ZnO nanowire cavity,” Phys. Rev. Lett. 97(14), 147401 (2006). [CrossRef] [PubMed]
• C. Weisbuch, M. Nishioka, A. Ishikawa, and Y. Arakawa, “Observation of the coupled exciton-photon mode splitting in a semiconductor quantum microcavity,” Phys. Rev. Lett. 69(23), 3314–3317 (1992). [CrossRef] [PubMed]
• A. Tredicucci, Y. Chen, V. Pellegrini, M. Börger, L. Sorba, F. Beltram, and F. Bassani, “Controlled Exciton-Photon Interaction in Semiconductor Bulk Microcavities,” Phys. Rev. Lett. 75(21), 3906–3909 (1995). [CrossRef] [PubMed]
• T. Nobis, E. M. Kaidashev, A. Rahm, M. Lorenz, and M. Grundmann, “Whispering gallery modes in nanosized dielectric resonators with hexagonal cross section,” Phys. Rev. Lett. 93(10), 103903 (2004). [CrossRef] [PubMed]
• L. Sun, Z. Chen, Q. Ren, K. Yu, L. Bai, W. Zhou, H. Xiong, Z. Q. Zhu, and X. Shen, “Direct observation of whispering gallery mode polaritons and their dispersion in a ZnO tapered microcavity,” Phys. Rev. Lett. 100(15), 156403 (2008). [CrossRef] [PubMed]
• S. Christopoulos, G. B. von Högersthal, A. J. D. Grundy, P. G. Lagoudakis, A. V. Kavokin, J. J. Baumberg, G. Christmann, R. Butté, E. Feltin, J. F. Carlin, and N. Grandjean, “Room-temperature polariton lasing in semiconductor microcavities,” Phys. Rev. Lett. 98(12), 126405 (2007). [CrossRef] [PubMed]
• L. S. Dang, D. Heger, R. André, F. Boeuf, and R. Romestain, “Stimulation of Polariton Photoluminescence in Semiconductor Microcavity,” Phys. Rev. Lett. 81(18), 3920–3923 (1998). [CrossRef]
• V. S. Ilchenko, A. A. Savchenkov, A. B. Matsko, and L. Maleki, “Nonlinear optics and crystalline whispering gallery mode cavities,” Phys. Rev. Lett. 92(4), 043903 (2004). [CrossRef] [PubMed]

Phys. Status Solidi C

• L. Sun, Z. Chen, Q. Ren, K. Yu, W. Zhou, L. Bai, Z. Q. Zhu, and X. Shen, “Polarized photoluminescence study of whispering gallery mode polaritons in ZnO microcavity,” Phys. Status Solidi C 6(1), 133–136 (2009). [CrossRef]

Science

• D. Snoke, “Spontaneous Bose coherence of excitons and polaritons,” Science 298(5597), 1368–1372 (2002). [CrossRef] [PubMed]
• R. Balili, V. Hartwell, D. Snoke, L. Pfeiffer, and K. West, “Bose-Einstein condensation of microcavity polaritons in a trap,” Science 316(5827), 1007–1010 (2007). [CrossRef] [PubMed]

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