Blackbody Radiation Emission Research Articles

A simple way to deduce the Planck equation of blackbody radiation emission

The blackbody radiation equation, also known as the Planck equation, has proved to be a challenge for students starting their studies in the field of thermal radiation, and this article aims to overcome this difficulty by presenting it in a simplified way. First, the classical approach to the blackbody derivation performed by the scientist Max Planck will be presented, which uses the concept of entropy, related to the different forms of energy distribution, in a thermodynamic system, complexion, according to Planck. Next, the deduction of the blackbody equation is presented, without resorting to complex calculations, but rather simple ones, from the approach carried out by Richard Feynman. Therefore, the objective of this article is to present the blackbody radiation equation, using basic concepts of average energy, and how the equation can be deduced from simple numerical calculations, without losing sight of the phenomenological character.

Electrical generation of terahertz blackbody radiation from graphene.

Recent experimental work on the application of graphene for novel illumination motivated us to present a theoretical study of the blackbody radiation emission from a freely suspended graphene driven by a dc electric field. Strong terahertz (THz) emission, with intensity up to mW/cm2, can be generated with increasing electric field strength due to the heating of electrons in graphene. We show that the intensity of the THz emission generated electrically from graphene depends rather sensitively on the lattice temperature in relatively weak electric fields, whereas it is less sensitive to the lattice temperature in relative strong electric fields. Our study highlights the practical application of graphene as intense THz source where the radiation is generated electrically.

Localized heating in nanoscale Pt constrictions measured using blackbody radiation emission

Using thermal emission microscopy, we investigate heating in Pt nanowires before and during electromigration. The wires are observed to reach temperatures in excess of 1000 K. This is beyond the thermal decomposition threshold for many organic molecules of interest for single molecule measurements with electromigrated nanogaps. Blackbody spectra of the hot Pt wires are measured and found to agree well with finite element modeling simulations of the electrical and thermal transport.

Spatial behavior of the coherence tensors for blackbody radiation emission

The paper discusses the tensor coherence properties of thermal radiation emitted into space by a blackbody source and presents numerical results for observation points restricted to a volume of space with linear dimensions small compared with the distance to the source, from which the source subtends a solid angle of circular cross section. For the first time, to my knowledge, surface and contour plots are given, showing the magnitude of the electric, magnetic, and mixed cross-spectral tensor components on selected planes as a function of the spatial separation between the observation points. Also, it is shown how these distributions change as the angular diameter of the source is varied. Small angular diameter sources are well described by the van Cittert–Zernike theorem of scalar coherence theory. For large angular diameter sources all nonzero components are of the same order of magnitude and are not properly described by the scalar theory. However, the trace of the electric tensor is in agreement with scalar theory.