title: Highly directional emission and photon beaming from nanocrystal quantum dots embedded in metallic nanoslit arrays.
abstract: We demonstrate a directional beaming of photons emitted from nanocrystal quantum dots that are embedded in a subwavelength metallic nanoslit array with a divergence angle of less than 4°. We show that the eigenmodes of the structure result in localized electromagnetic field enhancements at the Bragg cavity resonances, which could be controlled and engineered in both real and momentum space. The photon beaming is achieved using the enhanced resonant coupling of the quantum dots to these Bragg cavity modes, which dominates the emission properties of the quantum dots. We show that the emission probability of a quantum dot into the narrow angular mode is 20 times larger than the emission probability to all other modes. Engineering nanocrystal quantum dots with subwavelength metallic nanostructures is a promising way for a range of new types of active optical devices, where spatial control of the optical properties of nanoemitters is essential, on both the single and many photons level.
authors: The Benin School of Computer Sciences and Engineering, Hebrew University, Jerusalem 91904 Israel.
authors: Nitzan
authors: N
authors: Livneh
authors: Ayelet
authors: A
authors: Strauss
authors: Ilai
authors: I
authors: Schwarz
authors: Itamar
authors: I
authors: Rosenberg
authors: Adiel
authors: A
authors: Zimran
authors: Shira
authors: S
authors: Yochelis
authors: Gang
authors: G
authors: Chen
authors: Uri
authors: U
authors: Banin
authors: Yossi
authors: Y
authors: Paltiel
authors: Ronen
authors: R
authors: Rapaport
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D017785:Photons; D045663:Quantum Dots; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation
chemical_list: D008670:Metals