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Spatio-temporal dynamics and coherent control of quantum cascade laser frequency combs
Konečný, Aleš ; Souza, Patricia Lustoza de (oponent) ; Detz, Hermann (vedoucí práce)
Quantum cascade laser frequency combs are promising candidates for novel miniaturized spectrometers without any moving parts. They can be generated in the self-starting regime by an interplay of different nonlinearities induced by asymmetrical gain and waveguide dispersion. The available highly optimized tool based on the traveling wave model was used to simulate the self-starting combs. It was further extended by the optical injection locking functionality, the coherent technique of control of frequency combs. Subsequent simulations confirmed locking to the injected signal. Group velocity dispersion (GVD) has been found to have a significant impact on the range of locking. GVD was calculated for the typical device and the frequency comb was optically injection-locked in a detuning range from -2 to 47 MHz.
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Evaluation of Different Dielectrics For Mid-Infrared Waveguides
Konečný, Aleš ; Arregi Uribeetxebarria, Jon Ander (oponent) ; Detz, Hermann (vedoucí práce)
The utilization of plasmon polariton waveguides for mid-infrared light has proven its suitability for sensor applications. The waveguide can be surrounded by a gaseous or liquid phase medium, which contains an analyte substance of which the concentration can be measured. The electromagnetic field propagates along the waveguide, which has to satisfy low losses and sufficient interaction conditions. These are fulfilled using a thin dielectric layer applied on a metal surface. This thesis is focused on Si-based dielectrics. Within this work, multilayer waveguides were fabricated by high vacuum magnetron sputtering, plasma-enhanced vapor deposition and photolithography. The deposition was carried out on commonly used Si substrates and is ready to be transfered to InP-based chips. Evaluation of dielectric layers and fabrication methods are based on ellipsometric measurements of refractive index and extinction coefficient in the infrared spectrum.
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Spatio-temporal dynamics and coherent control of quantum cascade laser frequency combs
Konečný, Aleš ; Souza, Patricia Lustoza de (oponent) ; Detz, Hermann (vedoucí práce)
Quantum cascade laser frequency combs are promising candidates for novel miniaturized spectrometers without any moving parts. They can be generated in the self-starting regime by an interplay of different nonlinearities induced by asymmetrical gain and waveguide dispersion. The available highly optimized tool based on the traveling wave model was used to simulate the self-starting combs. It was further extended by the optical injection locking functionality, the coherent technique of control of frequency combs. Subsequent simulations confirmed locking to the injected signal. Group velocity dispersion (GVD) has been found to have a significant impact on the range of locking. GVD was calculated for the typical device and the frequency comb was optically injection-locked in a detuning range from -2 to 47 MHz.
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Evaluation of Different Dielectrics For Mid-Infrared Waveguides
Konečný, Aleš ; Arregi Uribeetxebarria, Jon Ander (oponent) ; Detz, Hermann (vedoucí práce)
The utilization of plasmon polariton waveguides for mid-infrared light has proven its suitability for sensor applications. The waveguide can be surrounded by a gaseous or liquid phase medium, which contains an analyte substance of which the concentration can be measured. The electromagnetic field propagates along the waveguide, which has to satisfy low losses and sufficient interaction conditions. These are fulfilled using a thin dielectric layer applied on a metal surface. This thesis is focused on Si-based dielectrics. Within this work, multilayer waveguides were fabricated by high vacuum magnetron sputtering, plasma-enhanced vapor deposition and photolithography. The deposition was carried out on commonly used Si substrates and is ready to be transfered to InP-based chips. Evaluation of dielectric layers and fabrication methods are based on ellipsometric measurements of refractive index and extinction coefficient in the infrared spectrum.
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