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A time-to-frequency converter based on a modified time lens is proposed and demonstrated experimentally. Return-to-zero pulse with a duty cycle of 33 % and 67 % are both accurately mapped into the spectral domain.
We propose a feedback method of adjusting the dual-beam exposure system with spherical collimation lenses based on deducing the spacing error from diffraction wavefront. The grating of 0.03 λ in 70×70 mm2 can be achieved.
We demonstrate an integrated four quadrant detector in silicon for infrared light, based on integration of plasmonic splitting, focusing and plasmonic enhanced internal photoemission detection on a single silicon plasmonic chip.
We demonstrate an electrowetting-based variable prism with dual prism-lens operation. A prism apex angle change of 19° at 35 V and curvature change to infinite focal length at 18.9 V are demonstrated.
We demonstrate that average orbital angular momentum (OAM) can be measured with a simplified twist parameter measurement technique. This technique uses a stationary apparatus composed of only a cylindrical lens and a CCD.
Specially formulated Gradient-Index polymeric optical materials offer capabilities not possible in present GRIN optics. A novel technology that enables large scale processing of nanolayered polymer films into real, performance-enhancing lenses for military Night-Vision-Goggle eyepieces is discussed.
We propose and demonstrate a novel design of simple and compact tunable fiber laser skillfully using chromatic aberration of a lens relay and a slit-like effect of optical fiber core.
Virtually lossless self-compression of 10-mJ 3.9-um sub-100 fs pulses in bulk YAG resulting in 9-mJ 33-fs pulses is reported. Generated peak power exceeds 250 GW which is suitable for filamentation in ambient air.
Planar Silicon waveguides provide up to 4 times wavelength compression, yielding sub-100nm focusing for visible light. Our near-field measurements for red light (671nm) show both wavelength compression (280nm) and super-focusing (80nm) to both bright and dark spots.
We demonstrate a THz lens designed using an artificial-dielectric medium fabricated from a stack of stainless-steel plates. The lens is capable of focusing a 20 mm diameter beam to a spot size of 4 mm.
We demonstrate a field-portable smartphone-based fluorescence microscopy platform for imaging and sizing of single DNA molecules across ∼2 mm2 field-of-view with <1 kbp length accuracy.
We demonstrate a new MEMS-Based Shadowless-illuminated variable-angle TIRF (SIVA-TIRF), which can realize two-plane, two-color TIRF imaging at the speed of 25Hz.
We present an optical imaging system based on photonic hypercrystal, an artificial optical medium combining the properties of hyperbolic materials and photonic crystals. This system functions as a negative refraction lens with substantially reduced image aberrations.
We present an athermalized design and performance analysis of a robust imaging system used to couple light from an input fiber to a superconducting nanowire single photon detector.
We report an efficient dielectric metasurface platform for complete control over polarization and phase of light with subwavelength spatial resolution. Using this platform, we experimentally demonstrate polarization switchable phase holograms and vector beam generators.
Imaging only azimuthally-polarized light from single fluorescent molecules avoids emission from the z component of their transition dipole moments, resulting in accurate measurement of location regardless of emitter orientation and degree of objective lens misfocus.
We present a reconfigurable transmission metasurface based on microfluidic system. As a proof of concept, the focal length of the metasurface is tuned from near-field region (1 λ) to far-field region (18 λ).
We design and experimentally demonstrate a free-space distance emulator for propagating OAM beams over long distances in a lab environment. The performance of the system is assessed by measuring spot radius and radius of curvature of propagated beams.
We experimentally observe Einstein's Rings caused by gravitational lensing by designing a refractive index profile analogous to the curvature of a star. We employ the experiment to produce collimated optical beams in homogenous media.
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