Near-field interactions among quantum emitters can be leveraged to realize useful novel light sources. One example is superradiance, the cooperative enhancement of spontaneous emission, which enables lasing with high spectral purity. Here, we numerically demonstrate suppression of superradiance in atomic arrays resonant with the epsilon-near-zero region of a nearby indium tin oxide (ITO) thin film. By exploiting the field-effect tunability of ITO, we show how cooperative emission can be switched on and off using a simple gold-oxide-ITO thin-film structure.
In this work, we demonstrated that metamaterials composed of alternating silver and silica layers of subwavelength thickness can act as an effective epsilon-near-zero (ENZ) medium. This ENZ condition is accessible to wide spectral tunability in the entire visible spectrum by adjusting the respective dimensions of constituent metal and dielectric. We also observed a pronounced enhancement of nonlinear response at the ENZ region. The capability to obtain large nonlinearities at pre-assigned optical wavelengths makes this class of metamaterials a flexible platform for nonlinear applications in the visible spectrum.
A simple and novel distributed tilted fiber Bragg gratings (TFBGs) based transverse load sensing system using optical
frequency domain reflectometry (OFDR) is proposed and demonstrated for the first time. The transverse load compresses
an elastomer material around the fiber and induces a broadband loss in the spectrum of the TFBG. The additional loss is
directly measured by the return loss spectrum of Fresnel reflection points introduced in the Rayleigh backscattering
trace. With the wavelength sweeping characteristic of OFDR, we realized distributed sensing by interrogating each of the
TFBGs with different wavelengths and observed a minimum crosstalk effect between sensors.
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