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Home Moldova Technologies Advanced ZnO Laser Nanoresonators for Photonics

Advanced ZnO Laser Nanoresonators for Photonics

Description

The control of the morphology of ZnO assembling is an effective way to design laser resonators. Due to a high optical quality, the material is a gain medium for stimulated emission. The combination of these two factors is an excellent basis for the development of a variety of new ultraviolet microlasers.

New methods for growing hierarchical ZnO structures by chemical vapour transport from a mixture of ZnO and carbon powders in a vertical or horizontal furnace with specific temperature gradients and carrier gas flow rates were developed. Those methods create conditions for radial self-assembling of hexagonal ZnO nanorods in cylindrical micro-clusters, or for the growth of hemispherical mi-cro-formations assembled from ZnO nanostructures.

ZnO structure in the form of a wire was grown with a modified vapour transport and condensation method. The wire consists of a dense core that may play the role of waveguide and a shell formed mainly from tertapod-type crystallites.

Innovative Aspect and Main Advantages

Technological advantages: technological methods developed are simple and cost effective, do not require evacuation systems, and, in some cases, even gas flows are not necessary.

Technical advantages: as a result of using the invention, the size of a laser resonator is reduced, the threshold for stimulated emission is diminished, the variety of resonators and laser modes is enlarged, which increases the performance of optoelectronic and photonic circuits, and reliability of identification and security systems.

The advantages of ZnO material over GaN, which is the main optoelectronic material used for applications in the UV spectral range, are summarized in the comparative matrix. The materials have nearly the same bandgap cor-responding to the UV spectral range. However, the exciton binding energy of ZnO is mach higher, assuring effective excitonic emission at room temperature, which is essential for UV laser applications.

Short comparative matrix



Fig. 1 SEM image of cylindrical self-assembled micro-structures of
the ZnO nano-wires and laser emission spectrum. Emission spectra
are measured with increasing excitation density from (1) to (5).

The produced ZnO laser structures are for optical pumping, since technological methods for a controlled p-type material growth are not available for ZnO.

Areas of Application

The produced structures are suitable for applications in integrated nanoscale optoelectronics, photonics, and sensor technologies requiring coherent UV light for signal processing.

Stage of Development

Experimental samples are prepared. The method are protected by:
- Moldavian Patent: MD 3320
- Moldavian Patent: MD 3822

Contact Details

Institute of Applied Physics, Academy of Sciences of Moldova
Address: Academia str.5, MD 2028, Chisinau, Rep. of Moldova
Contact person: Veaceslav Ursachi
Tel.: (+373-22) 23-75-08; 73-90-48
Fax.: (+373-22) 73-81-49
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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