Mode-resolved directional enhancement of spontaneous emission inside/outside finite multilayer hyperbolic metamaterials

Maryam Mahmoodi, Seyed Hassan Tavassoli*, Andrei V. Lavrinenko

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    The concept of large photonic density of states associated with high-k modes of hyperbolic metamaterials (HMMs) plays a significant role in the interests behind the HMM notion. Despite the theoretical predictions, it is proved that photonic local density of states (LDOS) is not infinite in practical multilayer HMMs. In the present study, a developed theory based on the effective medium approximation is used to probe the finite number of high-k modes in finite multilayer HMMs. The high-k modes are classified in two categories as short-range and long-range propagating modes, strongly dependent on the number of periods. Introducing a mode-resolved transition rate enhancement factor, emission coupling of a quantum emitter, placed inside and in near vicinity of HMM slabs, to the high-k modes is calculated. The results show that the short-range and long-range modes have the commanding influence on transition rate enhancement outside and inside the slabs, respectively. The results point out that HMM slabs having lower number of periods provide higher total LDOS giving rise to larger transition rate enhancement. The results prove the capability of engineering photonic density of states in finite HMMs and pave the way for application-orientated HMMs design.

    Original languageEnglish
    Article number100859
    JournalMaterials Today Communications
    Volume23
    Number of pages8
    ISSN2352-4928
    DOIs
    Publication statusPublished - 1 Jun 2020

    Keywords

    • High-k modes
    • Hyperbolic metamaterials
    • Local photonic density of states
    • Spontaneous emission transition rate

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