All-optical switching based on the electromagnetically induced transparency effect of an active photonic crystal microcavity

Abstract

2014) All-optical switching based on the electromagnetically induced transparency effect of an active photonic crystal microcavity, Journal of Modern Optics, 61:5, 403-408,We report a new all-optical switching in a two-dimensional photonic crystal microcavity made of semiconductor multiple quantum wells and realized based on the electromagnetically induced transparency effect with exciton and two-exciton energy levels. We use the quantum coherence effects to achieve small absorption of the probe field, and the absorption of the probe field can be adjusted by controlling the pump field and decay rate. We turn the control field into pulses of light field so that we can regulate the efficiency of the switch. Through selecting the appropriate control light field intensity, we can obtain a switching efficiency of 85% and a switching time is 10 ps. This result can be used for the development of new types of nanoelectronic devices for realizing the switching process.

Double electromagnetically induced transparency in a four-level lambda atomic system with doppler broadening

“…Even though electromagnetically induced transparency (EIT) has been well-studied over the last few decades [1,2], physicists and scientists still express their keen interest in both theoretical and experimental studies with different excited atomic configurations [3][4][5][6]. These excitements may result from the various application ranges of EIT materials in the fields of quantum computer and modern photonic devices [7]. The earliest models of EIT were proposed for three-level atomic systems which resulted only in one EIT window [8,9].…”

“…At present, several double EIT models for four-level atomic systems have been proposed, for example, four-level N-type [10], inverted Y-type [11], Y-type [14], tripod-type [7,12,17,18] configurations. In addition to theoretical studies, several experimental studies on EIT in fourlevel systems have also been published [10,19].…”

“…In addition to theoretical studies, several experimental studies on EIT in fourlevel systems have also been published [10,19]. Recently, multi-level EIT systems have found various applications such as optical bistability [12], optical switching [7], slow light [14], Kerr nonlinearity [19], and so on. Among all models of EIT in the four-level systems, the lambda configuration is more interesting than others because it is easy to create double window EIT with high transparency efficiency and therefore it is easy to observe experimentally.…”

Electromagnetically induced transparency at optical nanofiber–cesium vapor interface*

“…The absorption of the weak probe field at the resonant frequency is reduced when a strong control field is used. [4,[16][17][18] The EIT effect can be widely used in four-wave mixing, [19][20][21] all-optical switching, [22,23] slow light, and optical storage. [24,25] Recently, researchers have demonstrated EIT phenomenon in cold atoms ONF-based systems at ultralow power, and achieved the optical storage at the single photon level by the Λ-type EIT.…”