Hansuek Lee, Tong Chen, Jiang Li, Ki Youl Yang, Seokmin Jeon, Oskar Painter, and Kerry J Vahala. 2012. “
Chemically etched ultrahigh-Q wedge-resonator on a silicon chip.” Nat. Photonics, 6, 6, Pp. 369–373.
Publisher's VersionAbstractUltrahigh-Q optical resonators are being studied across a wide range of fields, including quantum information, nonlinear optics, cavity optomechanics and telecommunications. Here, we demonstrate a new resonator with a record Q-factor of 875 million for on-chip devices. The fabrication of our device avoids the requirement for a specialized processing step, which in microtoroid resonators8 has made it difficult to control their size and achieve millimetre- and centimetre-scale diameters. Attaining these sizes is important in applications such as microcombs and potentially also in rotation sensing. As an application of size control, stimulated Brillouin lasers incorporating our device are demonstrated. The resonators not only set a new benchmark for the Q-factor on a chip, but also provide, for the first time, full compatibility of this important device class with conventional semiconductor processing. This feature will greatly expand the range of possible `system on a chip' functions enabled by ultrahigh-Q devices.
Jiang Li, Hansuek Lee, Ki Youl Yang, and Kerry J. Vahala. 2012. “
Sideband spectroscopy and dispersion measurement in microcavities.” Optics Express, 20, 24, Pp. 26337–26344.
Publisher's VersionAbstractThe measurement of dispersion and its control have become important considerations in nonlinear devices based on microcavities. A sideband technique is applied here to accurately measure dispersion in a microcavity resulting from both geometrical and material contributions. Moreover, by combining the method with finite element simulations, we show that mapping of spectral lines to their corresponding transverse mode families is possible. The method is applicable for high-Q, micro-cavities having microwave rate free spectral range and has a relative precision of 5.5 × 10\textminus6 for a 2 mm disk cavity with FSR of 32.9382 GHz and Q of 150 milllion.
Ki Youl Yang, Vincenzo Giannini, Alexey O Bak, Hemmel Amrania, Stefan A Maier, and Chris C Phillips. 2012. “
Subwavelength imaging with quantum metamaterials.” Phys. Rev. B , 86, 7.
Publisher's VersionAbstractWe study the potential of a novel ``quantum metamaterial'' for subwavelength imaging applications in the midinfrared. Because the layers that comprise the metamaterial have in-plane and out-of-plane dielectric responses that are determined by different physical mechanisms (Drude free electron response and quantized electronic transitions, respectively), their resonances are polarization sensitive and can be designed independently. The result is a negatively refracting anisotropic effective medium with losses, described by the figure of meri