Abstract
Optical modal gain enhancement of CdSe nanocrystal quantum dots in a cylindrical glass-waveguide has been observed by using a variable stripe length method. While poor modal gain was observed near the threshold excitation energy (3.5 mJ) for a thin film structure, significant modal gain (∼ 500 cm−1) was seen in the cylindrical structure due to the waveguide effect. Modal gain saturation for a stripe length was also investigated with a new gain analysis (Kyhm et al 2001 Appl. Phys. Lett. 79 3434). The stripe length dependence of gain saturation is also suppressed in the waveguide structure above the threshold excitation energy (5.5 mJ). We suggest the modal gain enhancement is involved with the intrinsic two electron–hole pair excited states (anti-bonding biexcitons) and the extrinsic waveguide effect.
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