Strategija proračuna složenih optičkih višeslojeva

The demand for very special optical coatings, having unusual optical characteristics that have no similarities with the traditional coatings, steadily increases. Typical examples are colour temperature converters, some types of narrow band reflectors, etc. A thin-film designer often encounters the very well known problem of the starting design. In this paper, a strategy of multilayer design is described. Taking an example, the target function is defined and then the complete design procedure is illustrated. The use of only two popular optical multilayer materials, namely SiO2 and TiO2 is assumed. BK7 glass and air are assumed as surrounding media. In all analysed cases, only a certain number of alternating layers can be assumed as the starting point of the design procedure. The method of global multilayer design is used in the first step, it is followed by the Tikhonravov's design method, and finally by the gradient refinement. Other possible ways and methods are discussed, and some hints are given.
Zahtjevi za višeslojnim optičkim prekrivima posebnih, netradicionalnih značajki u stalnom je porastu. Primjeri su pretvarači temperature boje, uskopojasni reflektori, itd. Često smo suočeni s problemom početne strukture višesloja. Ovdje se opisuje strategija proračuna višesloja. Izabrana je proizvoljna ciljna funkcija i opisan cijeli postupak oblikovanja višesloja uz pretpostavku dvaju optičkih materijala, SiO2 i TiO2. Podloga je BK7 staklo a upadno sredstvo zrak. U prvom koraku primijenjena je metoda globalnog oblikovanja, zatim je upotrebljena Tikhonravova metoda i na kraju fina gradijentna metoda.