Metamaterials were assembled using the force of a light gradient in a one-dimensional Standing Wave Optical Trap (SWOT) that was time-shared across the 2-D lattice to create a three-dimensional (3D) array of traps, which was then populated with monodispersed dielectric or metallic nanoparticles (NPs). The NP structure was anchored to a hydrogel scaffold, and then the process was repeated to create macroscopic metamaterials. The error in particle position within a voxel (σ=55 nm) was limited by dark time Brownian motion, whereas the error between voxels, (σ=88 nm) was limited by the microscope stage repeatability. Also, compared to a Gaussian beam SWOT, a non-diffractive, pseudo-Bessel beam SWOT produced a longer array due to greater focus-depth and self-healing distance.
Tm-doped fiber amplifiers are good sources for high energy laser, DIRCM, LIDAR, remote sensing and spectroscopy. The reported Tm-doped amplifiers have efficiencies between 55% to 65%. The diode lasers that are commercially available at 793 nm produce about 35% ex-fiber efficiency. Therefore, the power conversion efficiency of Tm-doped amplifiers is only in the range of 20% - 23% which is less than half that of Yb-doped amplifiers. One straightforward way to improve the e-o power conversion efficiency of Tm-doped fiber amplifiers is to boost the efficiency of 793 nm diode pump from 35% to >55%. This will enable >36% efficient Tm-doped fiber amplifiers. With improvement in epitaxial design, we have demonstrated 64% at 15.5 W producing fiber-coupled package with 400 W in 225-μm/0.22 NA and 54% ex-fiber efficiency in packages with <0.63 kg/kW and <0.49 cc/W specific mass and specific volume, respectively. Further improvement is underway and we will update the latest results.
Recent years have witnessed an inflow of ideas from quantum field theory and condensed matter physics into the field of optics. In this talk, we describe how notions from topological physics and supersymmetry can be used in designing novel laser arrays with properties that are of interest in some applications. Likewise, such lasing arrangements can be used to emulate a variety of topological and supersymmetric phenomena, beyond what is possible in their respective original platforms.
This Conference Presenatation, Non-Hermitian ring laser gyroscope with an enhanced Sagnac sensitivity, was recorded at Photonics West 2020 held in San Francisco, California, United States.
Supersymmetric transformations aim to relate boson and fermions, two different species of particles, and their interactions. In quantum mechanics, the mathematical framework of SUSY can be used to design isospectral potentials. By virtue of the isomorphism between Schrodinger and wave equations, one can use such transformations for designing novel optical systems. In this talk, we review the recent developments in the general area of supersymmetric optics and photonics. We will also discuss the possibility of generating high brightness coherent light in supersymmetric laser arrays.
Sub-wavelength metamaterial structures are of great fundamental and practical interest because of their ability to manipulate the propagation of electromagnetic waves. We review here our recent work on the design, simulation, implementation and equivalent circuit modeling of metamaterial devices operating at Terahertz frequencies. THz metamaterials exhibiting plasmon-induced transparency are realized through the hybridization of double split ring resonators on either silicon or flexible polymer substrates and exhibiting slow light properties. THz metamaterials perfect absorbers and stereometamaterials are realized with multifunctional specifications such as broadband absorbing, switching, and incident light polarization selectivity.
Devices operating at THz frequencies have been continuously expanded in many areas of application and major research
field, which requires materials with suitable electromagnetic responses at THz frequency ranges. Unlike most naturally
occurring materials, novel THz metamaterials have proven to be well suited for use in various devices due to narrow and
tunable operating ranges. In this work, we present the results of two THz metamaterial absorber structures aiming two
important device aspects; polarization sensitivity and broad band absorption. The absorbers were simulated by finite
element method and fabricated through the combination of standard lift-off photolithography and electron beam metal
deposition. The fabricated devices were characterized by reflection mode THz time domain spectroscopy. The narrow
band absorber structures exhibit up to 95% absorption with a bandwidth of 0.1 THz to 0.15 THz.
Among electromagnetic spectrum, terahertz region has been utilized less due to the lack of appropriate devices that works well in these frequencies But recently growing interest has been focused to design devices with functionality in terahertz region because of potential terahertz applications. We present a novel structure that broadens bandwidth of terahertz metamaterial absorber. Our structure takes a benefit of multiband absorber by making the bands close enough to each other but in a multilayer pattern. The absorber has composed of two concentric copper rings in two different layers followed by polyimide and a metal back layer. Simulation shows 100 GHz bandwidth which is double of that of a single layer single ring absorber.
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