Dr Maziar Nezhad's Outputs (64)

Nanophotonic devices and circuits (2011)
Presentation / Conference Contribution

Advances in nanoscale fabrication techniques in dielectric and metallic material systems has opened up new opportunities in photonics and plasmonics for solving long standing problems in information systems and telecommunication systems. In this talk... Read More about Nanophotonic devices and circuits.

Electrically pumped sub-wavelength metallodielectric pedestal pillar lasers (2011)
Journal Article

Electrically driven subwavelength scale metallo-dielectric pedestal pillar lasers are designed and experimentally demonstrated. The metallo-dielectric cavity significantly enhances the quality factor (Q > 1500) of the wavelength and subwavelength sca... Read More about Electrically pumped sub-wavelength metallodielectric pedestal pillar lasers.

Etch-free low loss silicon waveguides using hydrogen silsesquioxane oxidation masks (2011)
Journal Article
Nezhad, M., Bondarenko, O., Khajavikhan, M., Simic, A., & Fainman, Y. (2011). Etch-free low loss silicon waveguides using hydrogen silsesquioxane oxidation masks. Optics Express, 19(20), 18827-18832. https://doi.org/10.1364/OE.19.018827

An etch-free fabrication technique for creating low loss silicon waveguides in the silicon-on-insulator material system is proposed and demonstrated. The approach consists of local oxidation of a silicon-on-insulator chip covered with a e-beam patter... Read More about Etch-free low loss silicon waveguides using hydrogen silsesquioxane oxidation masks.

Third-order nonlinearity in silicon beyond 2350 nm (2011)
Journal Article

Measurement of the Kerr nonlinearity in silicon is reported in the 2350 nm to 2750 nm wavelength range, where three-photon absorption effect is present. The measurements confirm that the Kerr interaction strength is comparable to that in the near... Read More about Third-order nonlinearity in silicon beyond 2350 nm.

Active and passive composite metal-Dielectric nanophotonic devices (2011)
Presentation / Conference Contribution

We explore metallo-dielectric composite nanostructures for localization and resonant excitation of optical fields and investigate design, fabrication and testing of nanolasers. Integration with silicon photonics material platform is demonstrated.

Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects (2011)
Presentation / Conference Contribution

We demonstrate an add/drop filter based on coupled vertical gratings on silicon. The concept is extended to implement a 1 by 4 wavelength division multiplexer with 3nm bandwidth, 1dB insertion loss and 16dB crosstalk suppression.

Near-field measurement of amplitude and phase in silicon waveguides with liquid cladding (2011)
Presentation / Conference Contribution

This work demonstrates a technique that allows optical near-field characterization of devices while preserving their optical properties. To do so, a liquid overcladding is introduced to emulate the actual overcladding of the final operational device... Read More about Near-field measurement of amplitude and phase in silicon waveguides with liquid cladding.

Fabrication approaches for metallo-dielectric nanolasers (2011)
Presentation / Conference Contribution

Metallo-dielectric lasers fabricated using different bonding techniques are discussed. Lasing at cryogenic and room temperatures is demonstrated.

Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects (2011)
Journal Article

We demonstrate an add/drop filter based on coupled vertical gratings on silicon. Tailoring of the channel bandwidth and wavelength is experimentally demonstrated. The concept is extended to implement a 1 by 4 wavelength division multiplexer with 6nm... Read More about Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects.

Compact chip-scale filter based on curved waveguide Bragg gratings (2010)
Journal Article
Zamek, S., Tan, D., Khajavikhan, M., Ayache, M., Nezhad, M., & Fainman, Y. (2010). Compact chip-scale filter based on curved waveguide Bragg gratings. Optics Letters, 35(20), 3477-3479. https://doi.org/10.1364/OL.35.003477

We propose a method for miniaturization of filters based on curved waveguide Bragg gratings, so that long structures can be packed into a small area on a chip. This eliminates the stitching errors introduced in the fabrication process, which compromi... Read More about Compact chip-scale filter based on curved waveguide Bragg gratings.

Active and passive nanophotonics for information systems applications (2010)
Presentation / Conference Contribution

This paper explores the role of nanotechnology with focus on nanophotonics in dielectric, metal, and semiconductor inhomogeneous metamaterials and devices for optical communications, information and signal processing, and sensing.

Measurement of the optical properties of gold at cryogenic temperatures (2010)
Presentation / Conference Contribution

Optical constants of gold are measured at cryogenic temperatures. The imaginary part of epsilon exhibits a drop at longer wavelengths. This directly demonstrates that performance of metal-based optical devices can be improved by cryogenic cooling.

Curved waveguide Bragg gratings on a chip (2010)
Presentation / Conference Contribution

We demonstrate curved waveguide Bragg gratings on an SOI chip. Our approach allows long Bragg gratings to be fabricated on an extremely small area, avoiding write-field stitching errors, typically introduced in the fabrication process.

Polarization weighting of Fano-type transmission through bi-dimensional metallic gratings (2010)
Journal Article

We demonstrate an approach allowing isolating effects of surface plasmon polariton mediated resonant transmission in a periodic grating by means of polarization rotation. The grating comprises a square array of cylindrical holes in an optically thick... Read More about Polarization weighting of Fano-type transmission through bi-dimensional metallic gratings.

Wavelength selective coupler on silicon for applications in wavelength division multiplexing (2010)
Presentation / Conference Contribution

A wavelength selective add/drop filter based on coupled vertical gratings is proposed for applications in wavelength division multiplexing on silicon. We demonstrate tailoring of device bandwidth and channel location.

Room-temperature subwavelength metallo-dielectric lasers (2010)
Journal Article

We demonstrate room-temperature pulsed laser emission from optically pumped metallo-dielectric cavities that are smaller than their emission wavelength in all three dimensions. The cavity consists of an aluminium/silica bi-layer shield surrounding an... Read More about Room-temperature subwavelength metallo-dielectric lasers.

Coupled vertical gratings on silicon for applications in wavelength division multiplexing (2010)
Presentation / Conference Contribution

An add/drop filter based on coupled vertical gratings is presented on silicon. We analyze the device theoretically and experimentally and show that the concept is easily extended to multi-channel add/drop filters. We demonstrate tunability of the dev... Read More about Coupled vertical gratings on silicon for applications in wavelength division multiplexing.

Nanophotonics for integrated information systems (2010)
Presentation / Conference Contribution

Advances in nanoscale fabrication techniques in dielectric and metallic material systems has opened up new opportunities in photonics and plasmonics for solving long standing problems in information systems and telecommunication systems. Optics in ge... Read More about Nanophotonics for integrated information systems.

Room temperature operation of subwavelength metallo-dielectric lasers (2009)
Presentation / Conference Contribution

Lasing is demonstrated in optically pumped InGaAsP-SiO2-aluminum structures, where both the resonator and the optical mode are subwavelength in all three dimensions. In the smallest case, a 550nm diameter InGaAsP disk exhibits lasing at 1390nm.

Room temperature lasing from subwavelength metal-insulator-semiconductor structures (2009)
Presentation / Conference Contribution

We report pulsed room temperature lasing from optically pumped subwavelength metal-insulator-semiconductor structures. The lasers consist of InGaAsP gain disks embedded in a SiO 2 /aluminum bi-layer. Lasing at 1520 nm from a 730 nm gain core is demon... Read More about Room temperature lasing from subwavelength metal-insulator-semiconductor structures.