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Photon Bose-Einstein condensates are characterised by a quite weakinteraction, so they behave nearly as an ideal Bose gas. Moreover, since thecurrent experiments are conducted in a microcavity, the longitudinal motion isfrozen out and the photon gas represents effectively a two-dimensional trappedgas of massive bosons. In this paper we focus on a harmonically confined idealBose gas in two dimensions, where the anisotropy of the confinement allows fora dimensional crossover. If the confinement in one direction is strong enoughso that this squeezed direction is frozen out, then only one degree of freedomsurvives and the system can be considered to be quasi-one dimensional. In viewof an experimental set-up we work out analytically the thermodynamic propertiesfor such a system with a finite number of photons. In particular, we focus onexamining the dimensional information which is contained in the respectivethermodynamic quantities.

Thermodynamics of Trapped Photon Gases at Dimensional Crossover from 2D to 1D