Kontrola propagacije svjetlosti u nehermitskom dielektričnom mediju

master's thesis

• Title (english): Control of light propagation in a non-Hermitian dielectric medium
• Author: Luka Cavaliere Lokas
• Mentor: Neven Šantić (mentor)
• Mentor: Marinko Jablan (komentor)
• Committee member: Marinko Jablan (predsjednik povjerenstva)
• Committee member: Neven Šantić (član povjerenstva)
• Committee member: Petar Žugec (član povjerenstva)
• Committee member: Tamara Nikšić (član povjerenstva)
• Committee member: Miroslav Požek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2023-12-01, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Optička svojstva tvari predmet su opsežnih istraživanja moderne fizike zbog njihovih brojnih primjena u različitim granama tehnologije. Posebice zanimljivo područje fizike je nehermitska fotonika u okviru koje se teorijski predivda mogućnost izrade nevidljivog materijala. Za postizanje takvog stanja, potrebno je utjecati na osnovne fizikalne veličine poput apsorpcije i indeksa loma medija kojim se svjetlost prostire. U ovom radu uspostavljen je sustav za kontrolu propagacije svjetlosti u vrućim parama atoma rubidija 87Rb koji predstavlja nehermitski dielektrični medij. Izložena je teorijska osnova za opis pojave prostorne promjene indeksa loma u materijalu temeljena na elektromagnetski induciranoj transparenciji u frekventnom području daleko od atomskog prijelaza. Predstavljene su eksperimentalne tehnike korištene za stvaranje optički inducirane rešetke na atomima rubidija upotrebom kontinuiranog lasera. Istražena su široka frekventna područja u okolini dva prijelaza D2 linije gdje dolazi do promjene indeksa loma. Uz to, uspostavljen je sustav za frekventnu stabilizaciju lasera korištenjem tehnike spektroskopije prijenosom modulacije signala. Ovim radom ostvareni su preduvjeti za nastavak eksperimentalnog istraživanja mogućnosti koje pruža upravljanje apsorpcijom i indeksom loma u materijalu.

Abstract (english)

The optical properties of matter are the subject of extensive research in modern physics due to their numerous applications in various branches of technology. A particularly interesting field of physics is non-Hermitian photonics, within which the possibility of creating invisible material is theoretically foreseen. To achieve such a state, it is necessary to influence basic physical parameters of the medium through which the light propagates, such as absorption and refractive index. In this thesis, a system for controlling light propagation in hot vapors of rubidium atoms 87Rb, which represents a non-Hermitian dielectric medium, was established. The theoretical background for the description of the spatial change of the refractive index in the material based on the electromagnetically induced transparency in the frequency range far from the atomic transition is presented. Experimental techniques used to create an optically induced lattice on rubidium atoms using a continuous laser are described. Wide frequency ranges were investigated in the vicinity of two transitions of the D2 line where the refractive index changes. In addition, a system for frequency stabilization of the laser using the technique of spectroscopy by transmission of signal modulation was established. This thesis achieved the preconditions for the continuation of experimental research into the possibilities offered by the management of absorption and refractive index in the material.

• Keywords: nehermitski dielektrični medij; elektromagnetski inducirana transparencija; prostorna promjena apsorpcije i indeksa loma; optički potencijali
• Keywords (english): non-Hermitian dielectric medium; electromagnetically induced transparency; spatial change of absorption and refractive index; optical potentials
• Language: croatian
• URN:NBN: urn:nbn:hr:217:697970
• Study programme: Title: The University Integrated Undergraduate and Graduate Programme in Physics; Research Physics; specializations in: Research Physics; Course: Research Physics; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: sveučilišni magistar fizike (sveučilišni magistar fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-01-25 12:31:36