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Plasmonic nanohole electrodes for active color tunable liquid crystal transmissive pixels
10.1364/OL.42.002810 2017-07-13 Plasmonic pixels have been shown to offer numerous advantages over pigment-based color filters used in modern commercial liquid crystal (LC) displays. However, wideband dynamic tunability across the visible spectrum remains challenging. We experimentally demo... |
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On-chip reconfigurable optical add-drop multiplexer for hybrid wavelength/mode-division-multiplexing systems
10.1364/OL.42.002802 2017-07-13 A silicon-based on-chip reconfigurable optical add-drop multiplexer (ROADM) is presented for hybrid wavelength-division-multiplexing–mode-division-multiplexing systems. The present ROADM consists of a four-channel mode demultiplexer, four wavelength-selective... |
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Versatile backconversion-inhibited broadband optical parametric amplification based on an idler-separated QPM configuration
10.1364/OL.42.002806 2017-07-13 Conversion efficiency and phase-matching (PM) bandwidth are both critical issues for broadband parametric processes. In some sense, they determine the highest peak power achieved via the optical parametric amplification. In this Letter, a versatile idler-sepa... |
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Plasmonic nanohole electrodes for active color tunable liquid crystal transmissive pixels
10.1364/OL.42.002810 2017-07-13 Plasmonic pixels have been shown to offer numerous advantages over pigment-based color filters used in modern commercial liquid crystal (LC) displays. However, wideband dynamic tunability across the visible spectrum remains challenging. We experimentally demo... |
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Lens-free all-fiber probe with an optimized output beam for optical coherence tomography
10.1364/OL.42.002814 2017-07-13 A high-efficiency lensless all-fiber probe for optical coherence tomography (OCT) is presented. The probe is composed of a segment of large-core multimode fiber (MMF), a segment of tapered MMF, and a length of single-mode fiber (SMF). A controllable output be... |
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Portable laser spectrometer for airborne and ground-based remote sensing of geological CO2 emissions
10.1364/OL.42.002782 2017-07-11 A 24 kg, suitcase sized, CW laser remote sensing spectrometer (LARSS) with a ~2 km range has been developed. It has demonstrated its flexibility in measuring both atmospheric CO2 from an airborne platform and terrestrial emission of CO2 from a remote mud volc... |
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Optical heterodyne-enhanced chirped laser dispersion spectroscopy
10.1364/OL.42.002770 2017-07-11 A proof-of-concept heterodyne-enhanced chirped laser dispersion spectroscopy system is presented. In remote sensing systems where low return powers are expected, the addition of an optical local oscillator and subsequent nonlinear processing can provide impro... |
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Low photon count based digital holography for quadratic phase cryptography
10.1364/OL.42.002774 2017-07-11 Recently, the vulnerability of the linear canonical transform-based double random phase encryption system to attack has been demonstrated. To alleviate this, we present for the first time, to the best of our knowledge, a method for securing a two-dimensional ... |
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Broadband etching-free metal grating couplers embedded in titanium dioxide waveguides
10.1364/OL.42.002778 2017-07-11 Metal grating couplers embedded into a titanium dioxide layer are proposed. A coupling efficiency better than 20% is experimentally demonstrated with a 3 dB bandwidth of 86 nm which is in agreement with simulation results. This allowed us to perform error-fre... |
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Portable laser spectrometer for airborne and ground-based remote sensing of geological CO2 emissions
10.1364/OL.42.002782 2017-07-11 A 24 kg, suitcase sized, CW laser remote sensing spectrometer (LARSS) with a ~2 km range has been developed. It has demonstrated its flexibility in measuring both atmospheric CO2 from an airborne platform and terrestrial emission of CO2 from a remote mud volc... |