Design and investigation of surface addressable photonic crystal cavity confined band edge modes for quantum photonic devices

Abstract

We propose to use a localized Γ-point slow Bloch mode in a 2D-Photonic Crystal (PC) membrane to realize an efficient surface emitting source. This device can be used as a quantum photonic device, e.g. a single photon source. The physical mechanisms to increase the Q/V factor and to improve the directivity of the PC microcavity rely on a fine tuning of the geometry in the three directions of space. The PC lateral mirrors are first engineered in order to optimize photons confinement. Then, the effect of a Bragg mirror below the 2DPC membrane is investigated in terms of out-of-plane leakages and far field emission pattern. This photonic heterostructure allows for a strong lateral confinement of photons, with a modal volume of a few (λ/n)3 and a Purcell factor up to 80, as calculated by two different numerical methods. We finally discuss the efficiency of the single photon source for different collection set-up.

Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

“…The variable α is the effective Purcell factor for emission into continuum modes (0 α 1), representing the suppression of emission that is not matched to the confined modes of the cavity. The modified spontaneous emission rates were also simulated numerically using FDTD modelling, by comparing the total power radiated by the source in the cavity to that when emitting into free space [32,33]. This method has the advantage of taking into account in detail the modified local density of states, thus calculating the contribution from both resonant cavity modes and leaky modes, corresponding to i F P,i + α in equation (4).…”

The design of an optical triode

“…(12) and (13) into (6), we can obtain the transfer matrix M of one period, with Eqs. (7), (8) and (18), we can calculate the magnification β, they are shown in Figs. 4-9, which give the relation between magnification β and incident light frequency ω.…”

The optimal design of photonic crystal optical devices with step-wise linear refractive index

“…Due to the forbidden frequency range, known as photonic band gap (PBG) [5,6]. The existence of PBGs will lead to many interesting phenomena, e.g., modification of spontaneous emission [7][8][9][10] and photon localization [11][12][13][14]. Thus numerous applications of photonic crystal have been proposed in improving the performance of optoelectronic and microwave devices such as high-efficiency semiconductor lasers, right emitting diodes, wave guides, optical filters, high-Q resonators, antennas, frequency-selective surface, optical limiters and amplifiers [15][16][17][18].…”