M.Sc Thesis | |

M.Sc Student | Reiser Ariel |
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Subject | Enhanced Thermal Radiation due to Geometric Effects |

Department | Department of Electrical and Computers Engineering |

Supervisor | PROF. Levi Schachter |

Full Thesis text |

Black body radiation is one of the cornerstones of modern physics.
Measurements of the radiation were carried out in the end of the 19^{th}
century, but with no valid classical interpretation, a new idea had to emerge.
During the same time period the quantum hypothesis had arisen, and the
implementation of it to black body radiation gave both a satisfactory
explanation to the physical phenomenon, and also a proof for the validity of
the quantum theory.

This implementation, however, is not rigorous; to analytically
develop the equations, some assumptions were made, specifically *the
dimensions of the black body were assumed to be much larger than those of the
measured wavelengths*. In this work we elaborate on the case when this
assumption is not satisfied, as today there is increasing interest in observing
the same wavelengths as a century ago, while at the same time the manufacturing
processes allow for the construction of miniscule structures.

We shall show in this work that the thermal radiation spectrum is dependent on the geometry of the radiating body, and that significant discrepancies from the “normal” black body laws arise when the geometry is reduced to the order of magnitude of a wavelength. These discrepancies result, in certain frequency intervals, in an enhancement of the radiation.

This non-trivial phenomenon can be utilized to increase the efficiency of various detector systems, by designing an emitter with an enhanced spectrum at the detector’s