Electromagnetically-induced phase grating: A coupled-wave theory analysis

Abstract

We use a coupled-wave theory analysis to describe an atomic phase grating based on the giant Kerr nonlinearity of an atomic medium under electromagnetically induced transparency. An analytical expression is found for the diffraction efficiency of the grating. Efficiencies greater than 70% are predicted for incidence at the Bragg angle.

Electromagnetically induced blazed grating at low light levels

“…However, the grating of Ref. [13] showed a large sensitivity to the incidence angle, with the efficiency decreasing by 50% at an angular deviation from Bragg incidence as small as 2 mrad.…”

“…[10,13] the XPM phase shift between a signal and probe beam was explored to induce a phase grating on the atomic sample on which the probe beam could diffract. This was accomplished by superposing two signal fields at an angle to form a stationary-wave pattern in a direction perpendicular to the probe propagation.…”

“…These phase gratings, however, generate many diffraction orders, limiting the diffraction efficiency obtainable at any one of the orders. We showed recently that the first-order diffraction efficiency of the N -type atomic grating can be increased significantly (to over 70%) by having the probe beam impinge on the grating at a Bragg angle [13]. Alternatively, a blazed atomic grating, with near unity efficiency, can be * araujo@ifi.unicamp.br created in a three-level atom by using intensity-modulated images applied to a strong-coupling field [5].…”

Высокоэффективная Схема Перераспределения Оптического Излучения На Пространственных Решетках Атомных Населенностей

“…Пионерские теоретические [1] и экспериментальные [2] исследования эффекта электромагнитно индуцированных решеток (ЭМИР) вызывают существенный интерес, обусловленный потенциальными возможностями использования такого эффекта в оптических устройствах быстрого переключения света [3,4], хранения света [5,6] в настраиваемых фотонных ячейках [7], а также других приложений [8][9][10][11][12][13]. При этом для получения эффекта могут использоваться различные методы, такие как микроволновая модуляция одного из переходов атомной системы [14], использование гигантской керровской нелинейности [15][16][17], усиление спонтанно генерируемой когерентности [18], получение максимальной атомной когерентности [19], контроль спонтанного излучения атомов [20].…”

Vortex-based all-optical manipulation of stored light at low light levels

“…To extend the functionalities of EIT systems, transverse grating structures can be introduced into the strong coupling light fields, where all-optical beam steering and splitting can be efficiently and flexibly implemented [3][4][5][6][7]. To further enhance the photon-photon interactions, the giant cross-Kerr nonlinearity in coherent media plays a significant role in all-optical signal processing at low light levels [8][9][10][11][12][13][14][15][16]. Particularly, in a four-level N-type EIT system, the probe light field can be first mapped into the atomic spin excitation (i.e., light storage) [17].…”