Frequency combs, analogue to digital sampling, and free space optical communications are emerging applications that can benefit from advances in elegant, compact, and high-performance miniature mode-locked lasers. By ...
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ISBN:
(纸本)9781510631410
Frequency combs, analogue to digital sampling, and free space optical communications are emerging applications that can benefit from advances in elegant, compact, and high-performance miniature mode-locked lasers. By virtue of their `chip-scale', and multiplicity of adjacent waveguides, compact planar waveguide devices are suited to efficiently operate in the similar to 0.5 GHz to 10 GHz pulse regimes, and to have key advantages when employed as dual-frequency combs. The erbium ytterbium cerium co-doped ZBLAN chips we have developed have achieved transform limited mode-locked output near 1.55 mu m, pulse lengths down to 180 fs, and operation up to 5 GHz. This paper will also cover our more recent work on demonstrating a dual-frequency comb based on simultaneously mode-locking adjacent waveguide lasers in a common-cavity setup and demonstrate its spectroscopic potential by rapidly (similar to ms) acquiring high resolution and broad (>2 THz) molecular spectra of molecules.
We propose a design and show simulation results for an AlGaAs waveguide device for performing four wave mixing where the pump mode has an orthogonal polarization to the signal and idler modes. (C) 2019 The Author(s)
ISBN:
(纸本)9781943580576
We propose a design and show simulation results for an AlGaAs waveguide device for performing four wave mixing where the pump mode has an orthogonal polarization to the signal and idler modes. (C) 2019 The Author(s)
Dual-comb spectroscopy of CO and CO2 is reported in the important 2-2.5 mu m atmospheric transparency window, using broadening in tailored Si3N4 waveguides and extending beyond Si-based fibers' transparency window...
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ISBN:
(纸本)9781943580576
Dual-comb spectroscopy of CO and CO2 is reported in the important 2-2.5 mu m atmospheric transparency window, using broadening in tailored Si3N4 waveguides and extending beyond Si-based fibers' transparency window. (c) 2019 The Author(s)
We present results from testing a new dispersion-free THz parallel-plate-based tapered structure optimized for focusing single-cycle THz pulses, producing high fields and with the potential for electron bunch compress...
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ISBN:
(纸本)9781943580576
We present results from testing a new dispersion-free THz parallel-plate-based tapered structure optimized for focusing single-cycle THz pulses, producing high fields and with the potential for electron bunch compression to a few femtoseconds. (c) 2019 The Author(s)
We propose a novel field-monitoring system for Stereotactic Radiation Therapy (SRT) based on scintillating waveguides ribbons with output image acquisition. waveguides ribbons are realized in two ways: micro-structuri...
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ISBN:
(纸本)9781728141640
We propose a novel field-monitoring system for Stereotactic Radiation Therapy (SRT) based on scintillating waveguides ribbons with output image acquisition. waveguides ribbons are realized in two ways: micro-structuring a scintillating sheet and using the SciFi detector technology. Both technologies provide sub-millimeter waveguide pitches suitable for SRT-field monitoring. The proposed system implemented in three different prototypes has been tested in clinical conditions. The obtained results from both ribbon technologies confirm suitable sensitivity and spatial resolution for SRT QA procedures.
Germanium has become a material of high interest for mid-infrared (MIR) integrated photonics due to its complementary metal{oxide{semiconductor (CMOS) compatibility and its wide transparency window covering the 2-15 m...
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ISBN:
(数字)9781510624894
ISBN:
(纸本)9781510624894
Germanium has become a material of high interest for mid-infrared (MIR) integrated photonics due to its complementary metal{oxide{semiconductor (CMOS) compatibility and its wide transparency window covering the 2-15 mu m spectral region exceeding the 4 mu m and 8 mu m limit of the Silicon-on-Insulator (SOI) platform and Si material respectively. Here, we present suspended germanium waveguides operating at wavelengths of 3.8 mu m and 7.67 mu m with propagation losses of 2.9 +/- 0.2 dB/cm and 2.6 +/- 0.3 dB/cm respectively.
Novel approaches for the design of all-dielectric silicon waveguides featuring strong field enhancement and low mode areas are presented. Deeply subwavelength transverse characteristics, previously limited to nano-pla...
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ISBN:
(纸本)9781943580576
Novel approaches for the design of all-dielectric silicon waveguides featuring strong field enhancement and low mode areas are presented. Deeply subwavelength transverse characteristics, previously limited to nano-plasmonic waveguides, are predicted in an all-dielectric platform. (C) 2019 The Author(s)
In this paper, we present the main results for the theoretical, numerical and experimental analysis of a new method to measure the roughness of metal surfaces. The requirements for a waveguide optical resonator, which...
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ISBN:
(数字)9781510629028
ISBN:
(纸本)9781510629028
In this paper, we present the main results for the theoretical, numerical and experimental analysis of a new method to measure the roughness of metal surfaces. The requirements for a waveguide optical resonator, which is the main optical node of the device implementing this method, have been developed. A comparative analysis of two different designs of an optical node is performed. The energy spectra of the roughness of various surfaces were measured. As a result of the research, the main advantages of the method under consideration and practical recommendations are provided to improve the design of the device that implements this method.
Recently, integrated silicon photonics have attracted much interest in mid-infrared applications for many reasons, such as gas sensing. Unfortunately, traditional silicon on silica waveguides suffer from huge silica a...
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ISBN:
(数字)9781510624894
ISBN:
(纸本)9781510624894
Recently, integrated silicon photonics have attracted much interest in mid-infrared applications for many reasons, such as gas sensing. Unfortunately, traditional silicon on silica waveguides suffer from huge silica absorption losses beyond the wavelength of 3.7 mu m, where the absorption fingerprint of many gases, such as carbon dioxide, exist. Also, power leakage from the waveguide core to the substrate is significant for the standard 2 mu m-thick buried silica underneath the 220 nm thick silicon layer at such long wavelengths. Therefore, efforts were exerted to find alternative materials, such as sapphire and silicon nitride, which offer lower absorption while keeping a strong refractive index contrast with silicon, and hence small fabrication footprints. In this work, though, we show that an optimized design of single-mode silicon on silica waveguides could push this technology limits deeper into the mid-infrared zone. A challenging wavelength of 4.28 mu m, where CO2 possesses a strong absorption peak, is chosen for this study. We show that the leakage loss can be eliminated using 5 mu m and 4 mu m thick buried silica layers for 220 nm and 300 nm thick silicon layers, respectively. The penalty of silica absorption is a propagation loss of approximately 6 dB/cm and 4 dB/cm for 220 nm and 300 nm thick silicon layers, respectively. The propagation loss can be further reduced using thicker silicon layers. Fortunately, the scattering loss decreases as the wavelength increases. Therefore, such a mature technology could still play a role in mid-infrared applications.
In this paper, we present results of numerical investigation of quantum walks (QWs) in different type arrays of single-mode waveguides: (i) regular arrays of identical waveguides (AIW), (ii) periodic arrays of two dif...
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ISBN:
(数字)9781510625099
ISBN:
(纸本)9781510625099
In this paper, we present results of numerical investigation of quantum walks (QWs) in different type arrays of single-mode waveguides: (i) regular arrays of identical waveguides (AIW), (ii) periodic arrays of two different waveguides (PAW), (iii) quasi-periodic arrays of waveguides with Fibonacci sequences (FAW), (iv) quasi-periodic arrays of waveguides with Thue-Morse sequences (TMAW). Our simulations show in contrast with randomly disordered systems, localized QWs in quasi-periodic arrays of waveguides FAWs and TMAWs are predictable and controllable due to the deterministic disorder nature of the quasi-periodic systems.
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