Direct measurement of tunable optical delays on chip analogue to electromagnetically induced transparency

Optics Express (Impact Factor: 3.49). 08/2006; 14(14):6463-8. DOI: 10.1364/OE.14.006463
Source: PubMed

ABSTRACT Direct time-domain measurement of tunable optical delay in a silicon resonating structure is presented. The structure is composed by a double-ring resonator, whose spectrum has a narrow transparency peak with low group velocity analogous to that in electromagnetically induced transparency. Effective group indices from 90 to 290 are obtained by tuning the resonator thermally. The measurements agree well with the theoretical analysis.

17 Reads
  • Source
    • "The transmission thus shows a dip with full-width-halfmaximum (FWHM) of 0.022 nm, corresponding to a quality factor of Q = 72 000. The transmission spectrum of the device shows a peak at the resonant wavelength of the FP-like mode (λ FP ), which is in contrast to ordinary FP cavities because the fourth-ring resonator is still a travelling wave cavity with no back reflection into the input waveguide at any wavelength [2] [16] [17]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The coupled-resonator-induced-transparency (CRIT) phenomenon in a novel optical resonator system is experimentally demonstrated. The system is composed of a four-ring resonator with a 20 μm diameter on silicon, whose spectrum has a narrow transparency peak with low group velocity. The CRIT effect is observed in the optical coupled-resonator because of classical destructive interference. In this reported work, a CRIT resonance with a quality factor of 7.2 × 104 is demonstrated with the same cavity size and the power coupling of the system is 60%, which agree well with the theoretical analysis. Then, through and drop transmission spectra of the resonator coincide well with each other. Simultaneously, the detuning resonant wavelength can be controlled by changing the temperature.
    Micro & Nano Letters 10/2013; 8(10):619-622. DOI:10.1049/mnl.2013.0232 · 0.85 Impact Factor
  • Source
    • "Each of these applications requires achieving a very particular state of interference, and therefore, the ability to tune the coupled resonator system is imperative. Tuning can be achieved through several different mechanisms: (1) changing the coupling strength between the resonators or between the waveguide and the adjacent resonator (Maleki et al. 2004; Naweed et al. 2005; Totsuka et al. 2007); (2) changing the internal losses in the coupled resonators (Sandhu et al. 2007); (3) photobleaching chromophores doped in polymer waveguides (Scheuer et al. 2005); and (4) detuning the resonances from each other, which has been achieved by changing the refractive index (RI) in one of the resonators utilizing temperature control or the free carrier dispersion effect (Xu et al. 2006, 2007). Changing the RI to detune one resonance can also be accomplished by optofluidics , which takes advantage of the adaptiveness of liquids for various configurations and their large RI tuning range (Psaltis et al. 2006). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The authors develop optofluidic coupled ring resonator (OCRR) system in which one of the ring resonators serves as a microfluidic channel. Highly sensitive tuning of the OCRR is demonstrated by making small changes in the refractive index of the fluid. A refractometric sensing scheme using the OCRR is proposed and demonstrated, allowing for measuring a refractive index change down to 10−9 refractive index units, two orders of magnitude better than a single ring resonator.
    Microfluidics and Nanofluidics 03/2009; 6(3):425-429. DOI:10.1007/s10404-008-0372-7 · 2.53 Impact Factor
  • Source
    • "More elaborated schemes involving not one, but several coupled resonators have been proposed in the past few years with various applications in mind, from enhanced filtering to slow light via structural " induced transparency " [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] . "
    [Show abstract] [Hide abstract]
    ABSTRACT: Exploiting the formal analogy between the transfer function of a micro-resonator and the optical susceptibility of an atomic medium, we investigate the spectral and energetic properties of active cavities seen as mesoscopic "photonic atoms". The resemblance is not limited to linear regime; a structural equivalent can be found for such fundamental processes as spontaneous emission, stimulated absorption and emission, saturation of the active medium or induced transparency.
    Proceedings of SPIE - The International Society for Optical Engineering 05/2008; DOI:10.1117/12.780799 · 0.20 Impact Factor
Show more


17 Reads
Available from