Light Outcoupling from Quantum Dot-Based Microdisk Laser via Plasmonic Nanoantenna

Abstract

Microdisk lasers demonstrate high performance and low threshold characteristics due to supporting of whispering gallery modes with a high quality factor. One of the challenging problems impeding some practical applications of whispering gallery mode lasers is that they have isotropic emission predominantly lying in the plane of the cavity. In this work, we present a novel method that provides both enhancement of the laser emission and modifies its directivity, making the vertical direction favorable. Electromagnetic energy outcouples from the cavity through the platinum−carbon plasmonic wire nanoantenna grown by electron-beam assisted deposition right up the side wall of the cavity. Evanescent field of whispering gallery mode excites surface plasmon polariton which propagates along the nanoantenna and scatters at its tip. We demonstrate 20× enhancement of the dominant mode intensity with 24 dB of side mode suppression increment without essential worsening of the Q-factor which remains over 3 × 10 4 . The proposed approach of the efficient control over the spectrum, directivity, and emission efficiency from microdisk lasers could be very promising for many practical applications from telecommunication technologies to biosensing.

Steering Directional Light Emission and Mode Chirality through Postshaping of Cavity Geometry

“…Various post-fabrication resonance tuning schemes for onchip integrated planar WGM cavities have been investigated, which mainly focus on the real part of mode energies. [36][37][38][39][40][41] Among them, EBID as a convenient and precise tool has been employed for generating additional 3D nanostructures, such as nanopillars on top of microdisks [42] and photonic crystals. [43] In the EBID method, released gaseous molecules get decomposed under the irradiation of a focused electron beam, resulting in the growth of nonvolatile structures on the focus site.…”

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

“…They have a profound impact on nanophotonics, providing efficient means to manipulate light and enhance light–matter interactions at the nanoscale . These nanostructures can significantly enhance the interactions between quantum emitters (e.g., quantum dots, defect centers in crystals, molecules) and their surrounding photonic environment, leading to giant luminescence enhancement, ultrafast emission in the picosecond range, strong coupling, surface‐enhanced Raman scattering (SERS), optical interconnections, and control of emission patterns . Because of these advantages, plasmonic nanostructures are broadly used in many applications, including near‐field microscopy, biosensors, photovoltaics, photodetection, and medicine .…”

Метод Матриц Рассеяния Для Расчета Спонтанной Излучательной Рекомбинации В Структурах С Цилиндрической Симметрией

“…H (1) (2) m (k ρext ρ) + r TE r αx TE (k ρext ρ 0 ) H (1) m (k ρext ρ) . (П.II.2б) Коэффициенты отражения от структуры r TM/TE даются выражениями (8), а коэффициенты отражения от оси симметрии r αx TM/TE представлены формулами (7). Безразмерный профиль поля цилиндрических волн в полностью однородной среде получается из (П.II.1), (П.II.2) при равенстве коэффициентов отражения от структуры коэффициентам отражения от оси симметрии r TM/TE = r αx TM/TE и при A TM/TE = 1:…”

“…Особый интерес вызывают эффекты, связанные с взаимодействием света и полупроводниковых нанообъектов в цилиндрических структурах. Так, полупроводниковые квантовые точки на основе InAs/InGaAs используются в качестве активной среды микродисковых лазеров, работающих на оптических модах шепчущих галерей [6,7]. Системы на основе квантовых проводов, обладающие цилиндрической симметрией, являются перспективными для создания источников одиночных фотонов [8].…”