| Résumé | We have developed and successfully tested models and numerical schemes for clean ablation of well-defined regions inside materials without causing damage to the surface and surrounding material, using lasers. The key to our approach is the ability to control the beam intensity along its axis. A high intensity radiation is delivered to the beam focal area, while the intensity is kept below damage threshold along the beam. The purpose of this study was to investigate if this program can be extended to microwave electromagnetic heating of selected regions inside the dielectrics. If successful, the new technique can be used to ablate prostate cancer non-intrusively as the treatment will not require bringing the EM radiation source close to the cancerous tissue.
In this study, the focal length of the lens and the beam diameter at the lens are calculated such that it can deliver high intensity electromagnetic radiation of a prescribed frequency to a given region inside the human body. However, the calculated parameters are inconvenient for an experimental implementation of the results. As the frequency is increased, experimental implementation of the technique becomes feasible, but a high frequency dose of radiation to the body results in increased damage. Thus, the present technique and results can be used to inscribe features inside the usual dielectrics with high frequency radiation, but achieving a similar goal with low frequency radiation will require an alternative technique or further innovation. |
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