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We study the opto-electronic properties of nanostructured materials and devices, and design
novel devices. In particular, we design quantum cascade lasers (QCLs) that can operate at a high temperature with very high efficiency.
We also design novel QCLs to generate ultra-short (sub-ps) pulses in the mid-IR, which is fundametally forbidden using conventional
modelocking techniques. We study the incoherent and coherrent carrier transport processes in QCLs.
Quantum cascade lasers
(QCLs) are
compact semiconductor light sources in the mid-IR range. The emission wavelength of QCLs can be tailored in the THz range too.
QCLs are electrically pumped unipolar devices where electrons cascade through the repeated structure after generating photons.
Since the generated wavelength depends on the energy spacing between two energy subbands in the conduction band, emission wavelength
depends on the design rather than on the material property.
Figure 1 shows a schematic illustration of the conduction band profile and cascading of the electrons through the repeated structure.
Figure 2 shows the moduli-squared wavefunctions and the conduction band energy diagram of one period of an actual QCL.
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| Fig. 1 |
Fig. 2 |
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| Principal Investigator |
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Dr. Muhammad Anisuzzaman Talukder
Office : ECE 527
Dept. of EEE
BUET
Dhaka 1000
Phone 9665650 Ext. 6582
FAX 8613046 |
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| News & Updates |
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Sep 08, 2024
Paper accepted at Energy Conversion and Management. more
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Aug 05, 2024
Paper published at Solar Energy. more
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Apr 26, 2019
Dr. Anis gave an invited talk at ICEECC 2019. more
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Apr 9, 2019
Paper accepted in Plasmonics. more
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