טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentReiser Ariel
SubjectEnhanced Thermal Radiation due to Geometric Effects
DepartmentDepartment of Electrical Engineering
Supervisor Professor Levi Schachter
Full Thesis textFull thesis text - English Version


Abstract

Black body radiation is one of the cornerstones of modern physics. Measurements of the radiation were carried out in the end of the 19th 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