All Outputs (54)

Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer (2011)
Journal Article
Khalil, G. E., Adawi, A. M., Robinson, B., Cadby, A. J., Tsoi, W. C., Kim, J.-S., Charas, A., Morgado, J., & Lidzey, D. G. (2011). Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer. Journal of Physical Chemistry B, 115(42), 12028-12035. https://doi.org/10.1021/jp206368g

We study the thiophene-based oligomer poly[2,7-(9,9-bis(2′-ethylhexyl)fluorene)-alt-2,5-terthiophene] (PF3T) in solution and when dispersed at low concentration into a polynorbornene matrix. We find that at high concentration in solution the 0–0 elec... Read More about Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer.

Vibrationally assisted polariton-relaxation processes in strongly coupled organic-semiconductor microcavities (2011)
Journal Article
Coles, D. M., Michetti, P., Clark, C., Tsoi, W. C., Adawi, A. M., Kim, J. S., & Lidzey, D. G. (2011). Vibrationally assisted polariton-relaxation processes in strongly coupled organic-semiconductor microcavities. Advanced Functional Materials, 21(19), 3691-3696. https://doi.org/10.1002/adfm.201100756

If a semiconductor with an electronic transition that approximates a two-level system is placed within an optical cavity, strong coupling can occur between the confined photons and the semiconductor excitons. This coupling can result in the formation... Read More about Vibrationally assisted polariton-relaxation processes in strongly coupled organic-semiconductor microcavities.

Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity (2011)
Journal Article
Virgili, T., Coles, D., Adawi, A. M., Clark, C., Michetti, P., Rajendran, S. K., Brida, D., Polli, D., Cerullo, G., & Lidzey, D. G. (2011). Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity. Physical review B: Condensed matter and materials physics, 83(24), 245309. https://doi.org/10.1103/PhysRevB.83.245309

We study an organic semiconductor microcavity operating in the strong-coupling regime using fs pump-probe spectroscopy. By probing the induced absorption associated with the one-exciton to two-exciton transition, we are able to characterize the time-... Read More about Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity.

Continuously tuneable optical filters from self-assembled block copolymer blends (2011)
Journal Article
Parnell, A. J., Pryke, A., Mykhaylyk, O. O., Howse, J. R., Adawi, A. M., Terrill, N. J., & Fairclough, J. P. A. (2011). Continuously tuneable optical filters from self-assembled block copolymer blends. Soft matter, 7(8), 3721. https://doi.org/10.1039/c0sm01320j

We demonstrate that two symmetric high molecular weight diblock copolymers, of differing molecular weights, can be blended together and subsequently shear aligned to form one photonic structure without macrophase separation. The lameller period depen... Read More about Continuously tuneable optical filters from self-assembled block copolymer blends.

A one-dimensional photonic-crystal nanocavity incorporating a fluorescent molecular dye (2010)
Journal Article
Murshidy, M. M., Adawi, A. M., Fry, P. W., & Lidzey, D. G. (2010). A one-dimensional photonic-crystal nanocavity incorporating a fluorescent molecular dye. Applied physics letters, 97(15), 153303. https://doi.org/10.1063/1.3497647

We model the optical properties of a SiN based one-dimensional waveguide photonic crystal nanocavity with three tapered air holes as a function of the photonic crystal mirror fill factor using finite difference time domain calculations. We show that... Read More about A one-dimensional photonic-crystal nanocavity incorporating a fluorescent molecular dye.

Transmission properties of plasmonic metamaterial quantum cascade lasers (2010)
Journal Article
Austin, D., Mullin, N., Bismuto, A., Luxmoore, I., Adawi, A. M., Revin, D. G., Soulby, M., Cockburn, J. W., Jiang, Q., Krysa, A. B., Cullis, A. G., Faist, J., Hobbs, J. K., & Wilson, L. R. (2010). Transmission properties of plasmonic metamaterial quantum cascade lasers. IEEE Photonics Technology Letters, 22(16), 1217-1219. https://doi.org/10.1109/LPT.2010.2052595

We report the results of transmission experiments performed on hybridized plasmonic metamaterial quantum cascade lasers. This device was formed by etching an array of split ring resonators (SRRs) onto the gold coated facet of a laser. Broadband midin... Read More about Transmission properties of plasmonic metamaterial quantum cascade lasers.

An optical nanocavity incorporating a fluorescent organic dye having a high quality factor (2010)
Journal Article
Adawi, A. M., Fry, P. W., Lidzey, D. G., & Murshidy, M. M. (2010). An optical nanocavity incorporating a fluorescent organic dye having a high quality factor. ACS Nano, 4(6), 3039-3044. https://doi.org/10.1021/nn1001479

We have fabricated an L3 optical nanocavity operating at visible wavelengths that is coated with a thin-film of a fluorescent molecular-dye. The cavity was directly fabricated into a pre-etched, free-standing silicon-nitride (SIN) membrane and had a... Read More about An optical nanocavity incorporating a fluorescent organic dye having a high quality factor.

The optical properties of hybrid organic-inorganic L3 nanocavities (2010)
Journal Article
Murshidy, M. M., Adawi, A. M., Fry, P. W., Whittaker, D. M., & Lidzey, D. G. (2010). The optical properties of hybrid organic-inorganic L3 nanocavities. Journal of the Optical Society of America B, 27(2), 215-221. https://doi.org/10.1364/JOSAB.27.000215

We report the fabrication of L3 nanocavities defined into a free-standing silicon nitride (SiN) membrane coated with a thin (10 nm) film of fluorescent red-emitting conjugated polymer. We find that structures both with and without the conjugated poly... Read More about The optical properties of hybrid organic-inorganic L3 nanocavities.

Photopatterning, Etching, and Derivatization of Self-Assembled Monolayers of Phosphonic Acids on the Native Oxide of Titanium (2009)
Journal Article
Tizazu, G., Adawi, A. M., Leggett, G. J., & Lidzey, D. G. (2009). Photopatterning, Etching, and Derivatization of Self-Assembled Monolayers of Phosphonic Acids on the Native Oxide of Titanium. Langmuir : the ACS journal of surfaces and colloids, 25(18), 10746-10753. https://doi.org/10.1021/la901271c

Electron-hole pair formation at titania surfaces leads to the formation of reactive species that degrade organic materials. Here, we describe the degradation of self-assembled monolayers of alkylphosphonic acids on the native oxide of titanium follow... Read More about Photopatterning, Etching, and Derivatization of Self-Assembled Monolayers of Phosphonic Acids on the Native Oxide of Titanium.

Single molecule spectroscopy of red- and green-emitting fluorene-based copolymers (2009)
Journal Article
Khalil, G. E., Adawi, A. M., Fox, A. M., Iraqi, A., & Lidzey, D. G. (2009). Single molecule spectroscopy of red- and green-emitting fluorene-based copolymers. The Journal of chemical physics, 130(4), 044903. https://doi.org/10.1063/1.3054142

Single molecule fluorescence spectroscopy is used to study the optical properties of two polymers: a fluorene-based statistical copolymer that contains a low fraction (10%) of a red-emitting thiophene group, and the green-emitting polymer poly(9,9-di... Read More about Single molecule spectroscopy of red- and green-emitting fluorene-based copolymers.

Optical nanolithography using a scanning near-field probe with an integrated light source (2008)
Journal Article
Kingsley, J. W., Ray, S. K., Adawi, A. M., Leggett, G. J., & Lidzey, D. G. (2008). Optical nanolithography using a scanning near-field probe with an integrated light source. Applied physics letters, 93(21), Article 213103. https://doi.org/10.1063/1.3032912

An ultracompact near-field optical probe is described that is based on a single, integrated assembly consisting of a gallium nitride (GaN) light-emitting diode (LED), a microlens, and a cantilever assembly containing a hollow pyramidal probe with a s... Read More about Optical nanolithography using a scanning near-field probe with an integrated light source.

A design for an optical-nanocavity optimized for use with surface-bound light-emitting materials (2008)
Journal Article
Adawi, A. M., & Lidzey, D. G. (2008). A design for an optical-nanocavity optimized for use with surface-bound light-emitting materials. New Journal of Physics, 10(6), 065011. https://doi.org/10.1088/1367-2630/10/6/065011

We model the modification in the spontaneous emission (SE) rate of an emitting dipole placed on the surface of a two-dimensional (2D) L3 optical nanocavity using 3D FDTD calculations. We show that by introducing a concave region into the cavity-surfa... Read More about A design for an optical-nanocavity optimized for use with surface-bound light-emitting materials.

Observation of the β-phase in two short-chain oligofluorenes (2008)
Journal Article
Tsoi, W. C., Charas, A., Cadby, A. J., Khalil, G., Adawi, A. M., Iraqi, A., Hunt, B., Morgado, J., & Lidzey, D. G. (2008). Observation of the β-phase in two short-chain oligofluorenes. Advanced Functional Materials, 18(4), 600-606. https://doi.org/10.1002/adfm.200700530

The polymer poly(9,9-dioctylfluorene) (PF8) can be driven into a morphological form termed the β-phase that has enhanced planarity and increased structural rigidity. We show that the β-phase can be generated in two different fluorene oligomers; a flu... Read More about Observation of the β-phase in two short-chain oligofluorenes.

Enhancing the radiative decay rate of fluorescent organic molecules using micropillar microcavities and optical nanocavities (2007)
Journal Article
Adawi, A. M., & Lidzey, D. G. (2008). Enhancing the radiative decay rate of fluorescent organic molecules using micropillar microcavities and optical nanocavities. Materials Science and Engineering: B, 149(3), 266-269. https://doi.org/10.1016/j.mseb.2007.10.005

We discuss the enhancement of spontaneous emission of fluorescent organic dyes when placed in micropillar microcavities and also in an optical nanocavity. We show experimentally that an enhancement in the spontaneous-emission rate of 1.78 +/- 0.04 ti... Read More about Enhancing the radiative decay rate of fluorescent organic molecules using micropillar microcavities and optical nanocavities.