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Coupled-resonator optical waveguides doped with nanocrystals
Björn M Möller1, Ulrike Woggon, Mikhail V Artemyev
1Fachbereich Physik, Universität Dortmund, Otto-Hahn-Strasse 4, 44227 Dortmund, Germany.
Optics Letters
|September 1, 2005
Summary
Semiconductor nanocrystal-doped microspheres form coupled-resonator optical waveguides (CROWs). Researchers observed photon mode coupling in these structures, demonstrating their potential for advanced optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Quantum Information Science
Background:
- Microsphere resonators offer unique optical properties for light confinement.
- Semiconductor nanocrystals provide efficient light emission and interaction.
- Coupled-resonator optical waveguides (CROWs) are promising for integrated photonic circuits.
Purpose of the Study:
- To investigate microsphere resonators doped with semiconductor nanocrystals as building blocks for CROWs.
- To study the transition of individual cavity modes into coherently coupled waveguide modes.
- To demonstrate the formation of multisphere photon states within CROW structures.
Main Methods:
- Utilized polarization-sensitive microphotoluminescence spectroscopy.
- Employed a bent linear array of microresonators.
- Probed cavity photon field properties via spatially and spectrally resolved nanocrystal emission measurements.
Main Results:
- Observed clear evidence of photon mode coupling.
- Identified characteristic mode splitting along the CROW structure.
- Analyzed emission intensity distributions to confirm coupled photon states.
Conclusions:
- Semiconductor nanocrystal-doped microspheres effectively function as components in CROWs.
- The study demonstrates coherent coupling of optical modes in multisphere systems.
- These findings pave the way for novel integrated photonic devices.