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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Light spectral filter based on Spatial Adiabatic Passage

Ricard Menchon-Enrich, Andreu Llobera, Jordi Vila‐Planas, Víctor J. Cadarso, J. Mompart, V. Ahufinger

Published May 1, 2013• 0 citations

Abstract

We report the first experimental realization of an analogous of the Stimulated Raman Adiabatic Passage (STIRAP) technique [1] working as a light spectral filter [2,3]. The system consists of three identical coupled total internal reflection silicon oxide waveguides designed such that there is a counterintuitive variation of the evanescent couplings between the waveguides along the propagation direction (see Fig.1(a)). If couplings are strong and wide enough along the propagation direction, which only occurs for long enough wavelengths, this geometry allows for an adiabatic following of a supermode that implies only the outermost waveguides. Thus, if light is injected into the right waveguide of our device, after propagating along the system, long wavelengths are transferred into the left output whereas short wavelengths end up into the central and right outputs. In this way, the system operates as a simultaneous high and low-pass spectral filter in the visible range. We refer to this device as Spatial Adiabatic Passage (SAP) filter. Regarding the filtering efficiency, the measured stopband reaches values up to -11dB for the left output, and around -20dB for the right plus central outputs. The passband values are close to 0dB for both cases. Fig. 1(b) shows the experimentally measured intensities at the output of the left waveguide and the sum of the outputs of the right and central waveguides as the transmittance relative to the total output intensity for one of the fabricated devices.

DOI: 10.1109/cleoe-iqec.2013.6800953

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We propose an adiabatic method for the robust transfer of light between the two outer waveguides in a three-waveguide directional coupler. Unlike the established technique inherited from stimulated Raman adiabatic passage (STIRAP), the method proposed here is symmetric with respect to an exchange of the left and right waveguides in the structure and permits the transfer in both directions. The technique uses the adiabatic elimination of the middle waveguide together with level crossing and adiabatic passage in an effective two-state system involving only the external waveguides. It requires a strong detuning between the outer and the middle waveguide and does not rely on the adiabatic transfer state (dark state) underlying the STIRAP process. The suggested technique is generalized to an array of

N

waveguides and verified by numerical beam propagation calculations.

We propose and demonstrate a novel type of optical integrated structure consisting of three adiabatically coupled waveguides arranged in an N-shaped geometry. Unlike conventional adiabatic three-waveguide couplers mimicking the stimulated Raman adiabatic passage process which utilize solely the counter-intuitive coupling and, thus, operate only in one direction, our structure achieves complete bidirectional light transfer between two waveguides through the counter-intuitive and intuitive coupling in either direction over a wide wavelength range. Moreover, the light transfer through the intuitive coupling is more efficient and robust than through the counter-intuitive coupling.

Grup d’Optica, Dept. de Fsica, Universitat Autonoma de Barcelona, E-08193Bellaterra, SpainDepartament de Micro i Nanosistemes, Institut de Microelectronica de Barcelona -Centre Nacional de Microelectronica, E-08193 Bellaterra, SpainE-mail: ricard.menchon@uab.catAbstract. Coherent control and manipulation of light propagation in systems ofthree coupled rib optical waveguides is addressed. We show that by an appropriatevariation of the distance among waveguides, it is possible to transfer a beam oflight between the outermost waveguides with very low excitement of the central one,resembling the Stimulated Raman Adiabatic Passage (STIRAP) technique. Resultsfor total internal reection (TIR) waveguides and for anti-resonant reecting opticalwaveguides (ARROW) are presented. In the case of TIR waveguides, we demonstratethat the system can be designed to be used as a spectral lter and as a refractometer.The possibility to use the system as a delay line by chaining a sequence of two STIRAPprocesses has been explored.Keywords: Total internal reection waveguides (TIR), anti-resonant reecting opticalwaveguides (ARROW), Stimulated Raman Adiabatic Passage (STIRAP).

We demonstrate experimentally the broadband and adiabatic light transfer in coupled waveguides based on multiple stimulated Raman adiabatic passage. Our experimental platform utilizes planar-type reconfigurable optically induced waveguide arrays and allows for efficient and robust transfer of light from an input waveguide over multiple states (up to nine) to an output waveguide. The same waveguide structures are tested for two propagation wavelengths separated by more than 200 nm, proving the achromaticity of the transfer process.

A novel design for complete transfer and robust three-waveguide coupler is presented in this paper, which employs shortcut to adiabaticity (STA) based on stimulated Raman adiabatic passage (STIRAP). Most recently, some remarkable papers on STA of STIRAP [Phys. Rev. A 94(6), 063411 (2016) and Nat. Comm. 7, 12479 (2016)] have been proposed in both theoretical and experimental configurations. In this paper, we propose to design a novel three-waveguide coupler by employing STA based on STIRAP, which can achieve much shorter device length and also maintain the robust performance against perturbations on device geometry parameters compared to previous devices. This finding significantly improves the performance and fabrication of integrated optical devices to build up more compactable devices.