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Conference on Lasers and Electro-Optics

Deterministic Phase-Control and Resonance-Detuning in Optical EIT-Like Coupled Resonances towards Dynamical Storage of Light

Xiaodong Yang, Mingbin Yu, Dim‐Lee Kwong, Chee Wei Wong

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We report first observations of deterministic phase- and resonance-controlled all-optical analogue to electromagnetically induced transparency in coherently-coupled silicon photonic crystal nanocavities through thermo-optic tuning method, for realization of all-optical dynamical storage of light.
DOI
10.1364/cleo.2009.cthbb5

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Quantum coherence in atomic systems has led to fascinating outcomes, such as laser cooling and trapping, Bose-Einstein condensates, and electromagnetically-induced-transparency (EIT). In EIT, the sharp cancellation of medium absorption has led to phenomena such as lasing without inversion, freezing light, and dynamic storage of light in a solid-state system. Similar to atomic systems, EIT-like effects can be observed through classical and optical means. Here we report the first experimental deterministic tuning of all-optical analogue to EIT in coherently-coupled standing-wave photonic crystal cavities. Our observations include transparency-resonance lifetimes more than three times the single loaded cavity, Fano-type lineshapes, and stepwise control of the coherent cavity-cavity interference. Our system, with wavelength-scale localization and coupled to a single waveguide, is analyzed well through the coupled-mode formalism which examines the delay in both transparency- and Fano-like lineshapes. Our observations support applications towards all-optical trapping, stopping and time-reversal of light in a solid-state scalable implementation.
We report first observations of deterministic phase- and resonance-controlled all-optical electromagnetically induced transparency in multiple coupled photonic crystal cavities. The full-range tuning of coherently coupled cavity-cavity phase and resonances allow observations of transparency resonance in dark states with lifetimes longer than incoherently summed individual cavities. Supported by theoretical analyses, our multipump beam approach allows arbitrary control in two and three coupled cavities, while the standing-wave wavelength-scale photon localization allows direct scalability for chip-scale optical pulse trapping and coupled-cavity QED.
We present experimental and theoretical studies of coupled resonances in multiple silicon photonic crystal cavities in an all-optical classical analogy to electromagnetically induced transparency. Multiple implementation schemes are demonstrated, such as two (in various configurations), and four cavities. The photonic crystal cavities are embedded in 2-D photonic crystal slabs and designed in the overcoupled regime. Our observations include measured transparency resonance lifetimes more than three times the single-cavity lifetimes, Fano-like lineshapes, and stepwise resonance control through multiple aligned external optical pump beams. All observed schemes are analyzed rigorously through finite-difference time-domain simulations and the coupled-mode formalism. Our experimental and theoretical results are applicable to optical pulse trapping and all-optical dynamical storage of light in the solid state.
Controlling the optical response of a medium through suitably tuned coherent electromagnetic fields is highly relevant in a number of potential applications, from all-optical modulators to optical storage devices. In particular, electromagnetically induced transparency (EIT) is an established phenomenon in which destructive quantum interference creates a transparency window over a narrow spectral range around an absorption line, which, in turn, allows to slow and ultimately stop light due to the anomalous refractive index dispersion. Here we report on the observation of a new form of both induced transparency and amplification of a weak probe beam in a strongly driven silicon photonic crystal resonator at room temperature. The effect is based on the oscillating temperature field induced in a nonlinear optical cavity, and it reproduces many of the key features of EIT while being independent of either atomic or mechanical resonances. Such thermo-optically induced transparency will allow a versatile implementation of EIT-analogs in an integrated photonic platform, at almost arbitrary wavelength of interest, room temperature and in a practical, low cost, and scalable system.