Tuning of an active photonic crystal cavity by an hybrid silica/silicon near-field probe

Université de Lyon, Institut des Nanotechnologies de Lyon INL-UMR 5270, CNRS, Ecole Centrale de Lyon, Ecully, France.
Optics Express (Impact Factor: 3.49). 11/2009; 17(24):21672-9. DOI: 10.1364/OE.17.021672
Source: PubMed


The influence of a near-field tip on the spectral characteristics of a resonant mode of an active photonic crystal micro-cavity was investigated. The wavelength shift of the mode was theoretically and experimentally demonstrated and evaluated as a function of the nature and the position of the tip above the cavity. Experiment showed that the shift induced is ten times higher with a Si-coated silica probe than with a bare silica tip: a shift until 2 nm was reached with Si-coated tip whereas the shift with bare silica tip is in the range of the tenth of nanometer, for wavelengths around 1,55 microm.

14 Reads
  • Source
    • "Basically, the cavity mode volume can be modified by immersing a small dielectric element within the evanescent field of the cavity [10] [11] [12] [13] [14]. Thereby, the effective volume of the latter is increased (light penetrates inside the dielectric) leading to a red shift of its RW. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Scanning Near-field Optical Microscopy (SNOM) has been successful in finely tuning the optical properties of photonic crystal (PC) nanocavities. The SNOM nanoprobes proposed so far allowed for either redshifting or blueshifting the resonance peak of the PC structures. In this Letter, we theoretically demonstrate the possibility of redshifting (up to +0.65nm) and blueshifting (up to $-5$~nm) PC cavity resonance with a single SNOM probe. This probe is obtained by opening a bowtie-aperture nano-antenna (BNA) at the apex of a metal-coated tip. This double-way PC tunability is the result of a competition between the effects of the BNA resonance (induced electric dipole leading to a redshift) and the metal-coated tip (induced magnetic dipole giving rise to a blueshift) onto the PC mode volume. The sign of the spectral shift is modified by simply controlling the tip-to-PC distance. This study opens the way to the full postproduction control of the resonance wavelength of high quality factor optical cavities.
  • Source
    • "This BNA-on-tip is coupled to a PC laser nanocavity which consists of a linear defect of 7 air cylindrical holes in a 2D triangular lattice PC [32] (period of 460 nm and hole radius of 100 nm, see Figure 2(b)). The two holes on both edges of the nanocavity are shifted by 80 nm outward in order to increase the Q-factor of the structure by 60 % and thus achieve easier laser emission. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We show that the near-field coupling between a photonic crystal microlaser and a nano-antenna can enable hybrid photonic systems that are both physically compact (free from bulky optics) and efficient at transferring optical energy into the nano-antenna. Up to 19% of the laser power from a micron-scale photonic crystal laser cavity is experimentally transferred to a bowtie aperture nano-antenna (BNA) whose area is 400-fold smaller than the overall emission area of the microlaser. Instead of a direct deposition of the nano-antenna onto the photonic crystal, it is fabricated at the apex of a fiber tip to be accurately placed in the microlaser near-field. Such light funneling within a hybrid structure provides a path for overcoming the diffraction limit in optical energy transfer to the nanoscale and should thus open promising avenues in the nanoscale enhancement and confinement of light in compact architectures, impacting applications such as biosensing, optical trapping, local heating, spectroscopy, and nanoimaging.
    Optics Express 06/2014; 22(12). DOI:10.1364/OE.22.015075 · 3.49 Impact Factor
  • Source
    • "The basic building blocks of the hybrid cavity structure are sketched in Fig. 1. It consists of two elements: a high-Q PC microcavity, that has been described and studied in former works [26] and a bowtie nano-antenna. The PC microcavity is designed to present a high-Q mode (5800) at telecom wavelength (Fig. 1(c)). "
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose and demonstrate a hybrid photonic-plasmonic nanolaser that combines the light harvesting features of a dielectric photonic crystal cavity with the extraordinary confining properties of an optical nano-antenna. In that purpose, we developed a novel fabrication method based on multi-step electron-beam lithography. We show that it enables the robust and reproducible production of hybrid structures, using fully top down approach to accurately position the antenna. Coherent coupling of the photonic and plasmonic modes is highlighted and opens up a broad range of new hybrid nanophotonic devices.
    Nanotechnology 05/2014; 25(31). DOI:10.1088/0957-4484/25/31/315201 · 3.82 Impact Factor
Show more


14 Reads
Available from