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Singh V.,Massachusetts Institute of Technology | Lin P.T.,Massachusetts Institute of Technology | Patel N.,Massachusetts Institute of Technology | Lin H.,University of Delaware | And 20 more authors.
Science and Technology of Advanced Materials | Year: 2014

In this article, we review our recent work on mid-infrared (mid-IR) photonic materials and devices fabricated on silicon for on-chip sensing applications. Pedestal waveguides based on silicon are demonstrated as broadband mid-IR sensors. Our low-loss mid-IR directional couplers demonstrated in SiNx waveguides are useful in differential sensing applications. Photonic crystal cavities and microdisk resonators based on chalcogenide glasses for high sensitivity are also demonstrated as effective mid-IR sensors. Polymer-based functionalization layers, to enhance the sensitivity and selectivity of our sensor devices, are also presented. We discuss the design of mid-IR chalcogenide waveguides integrated with polycrystalline PbTe detectors on a monolithic silicon platform for optical sensing, wherein the use of a low-index spacer layer enables the evanescent coupling of mid-IR light from the waveguides to the detector. Finally, we show the successful fabrication processing of our first prototype mid-IR waveguide-integrated detectors. © 2014 National Institute for Materials Science.

Lin H.,University of Delaware | Li L.,University of Delaware | Deng F.,University of Delaware | Ni C.,University of Delaware | And 4 more authors.
Optics Letters | Year: 2013

We have demonstrated what we believe to be the first waveguide photonic crystal cavity operating in the midinfrared. The devices were fabricated from Ge23Sb7S70 chalcogenide glass (ChG) on CaF 2 substrates by combing photolithographic patterning and focused ion beam milling. The waveguide-coupled cavities were characterized using a fiber end fire coupling method at 5.2 μm wavelength, and a loaded quality factor of ̃2000 was measured near the critical coupling regime. © 2013 Optical Society of America.

Zou Y.,University of Delaware | Moreel L.,University of Delaware | Lin H.,University of Delaware | Zhou J.,University of Delaware | And 8 more authors.
Advanced Optical Materials | Year: 2014

Organic polymer materials are widely credited with extreme versatility for thin film device processing. However, they generally lack the high refractive indices of inorganic semiconductors essential for tight optical confinement in planar integrated photonic circuits. Inorganic-organic hybrid photonic systems overcome these limits by combining both types of materials, although such hybrid integration remains challenging given the vastly different properties of the two types of materials. In this paper, a new approach is used to realize inorganic-organic hybrid photonics using chalcogenide glass (ChG) materials. Known as an amorphous semiconductor, the glass possesses high refractive indices, and can be prepared in a thin film form through solution deposition and patterned via direct thermal nanoimprinting, processing methods traditionally exclusive to polymer materials only. Sub-micrometer waveguides, microring resonators, and diffraction gratings fabricated from solution processed (SP) ChG films can be monolithically integrated with organic polymer substrates to create mechanically flexible, high-index-contrast photonic devices. The resonators exhibit a high quality factor (Q-factor) of 80 000 near 1550 nm wavelength. Free-standing, flexible ChG gratings whose diffraction properties can be readily tailored by conformal integration on nonplanar surfaces are also demonstrated. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

IRradiance Glass | Entity website

Jennifer McKinley, member of the UCF College of Sciences Alumni Board (and IRGs COO), volunteered for UCFs day of service event, Knights Give Back, on October 3, 2015. Alumni and students worked to make oyster mats to help with oyster reef restoration efforts ...

Zou Y.,University of Delaware | Zhang D.,University of Delaware | Lin H.,University of Delaware | Li L.,University of Delaware | And 10 more authors.
Advanced Optical Materials | Year: 2014

This paper reports a versatile technique for the fabrication of high-index-contrast photonic structures on both silicon and plastic substrates. The fabrication technique combines low-temperature chalcogenide glass film deposition and resist-free single-step thermal nanoimprint to process low-loss, sub-micron single-mode waveguides with a smooth surface finish using simple contact photolithography. Using this approach, the first chalcogenide glass microring resonators are fabricated by thermal nanoimprinting. The devices exhibit an ultra-high quality factor of 4 × 105 near 1550 nm wavelengths, which represents the highest value reported in chalcogenide glass microring resonators. Furthermore, sub-micrometer nanoimprinting of chalcogenide glass films on non-planar plastic substrates is demonstrated, which establishes the method as a facile route for the monolithic fabrication of high-index-contrast devices on a wide array of unconventional substrates. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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