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Optical Characterization of Cadmium Telluride Doped Heterostructured Opaline Photonic Crystal

  • V. G. Solovyev (a1), S.G. Romanov (a1), C.M. Sotomayor Torres (a1), N. Gaponik (a2), A. Eychmüller (a2) and A. L. Rogach (a2)...

Abstract

A double-layer photonic crystal (PhC) possessing incomplete photonic band gap (PBG) has been prepared by successive formation of one opaline film on top of another and subsequent impregnation with CdTe colloidal nanocrystals as the light source. Transmission, reflection and photoluminescence (PL) spectra of this nanocomposite have been measured from 1.8 to 2.5 eV at different angles of the light incidence and detection. The suppression of emission intensity has been found at both stop bands of the PhC heterostructure. Depending on the excitation power, either suppression or enhancement of the emission rate at the stop band has been observed.

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1. Romanov, S.G., Yates, H.M., Pemble, M.E., Rue, R.M. De La, J. Phys.: Condens. Matter 12, 8221 (2000).
2. Jiang, P., Ostojic, G.N., Narat, R., Mittelman, D.M., Colvin, V.L., Adv. Materials 13, 389 (2001).
3. Romanov, S. G., Maka, T., Torres, C.M. Sotomayor, Müller, M., Zentel, R., in “Photonic Crystals and Light Localisation in the 21 st Century”, NATO ASI series ed. Soukoulius, C.M., NATO Science Series C, v. 563, Kluwer, Dordrecht, 2001, pp.253262.
4. Rogach, A. L., Katsikas, L., Kornowski, A., Su, D., Eychmüller, A., Weller, H., Synthesis and characterization of thiol-stabilized CdTe nanocrystals, Ber. Bunsenges. Phys. Chem., 100, 1772 (1996).
5. Romanov, S. G., Torres, C. M. Sotomayor, Gaponik, N., Eychmüller, A., Rogach, A. L., submitted to IEEE Quant. Electronics.

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