Journal Articles
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884
Browse
69 results
Search Results
Item Effect of Residual Resist on Performance of Single-Mode 1× 4 Optical Splitter in Photosensitive Polymer(2010) Singhal, R.; Satyanarayan, M.N.; Pal, S.Polymer residues are generally left in the Y-junctions of the conventional splitters. Besides increased insertion loss, the Y-junction residue results in asymmetric distribution of power at device outputs. An analysis of the device performance in the presence of junction residue is presented and a design to overcome the non-uniformities in output power distribution brought about by the presence of the residue is proposed. © Taylor & Francis Group, LLC.Item 2-Oxo-2-phenyl-ethyl benzoate(2011) Fun, H.-K.; Arshad, S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.In the title compound, C15H12O3, the terminal phenyl rings make a dihedral angle of 86.09 (9)° with each other. In the crystal, a pair of inter-molecular C - H?O hydrogen bonds link the mol-ecules, forming a dimer with an R2 2(10) ring motif.Item 2-(4-Bromo-phen-yl)-2-oxoethyl 4-meth-oxy-benzoate(2011) Fun, H.-K.; Loh, W.-S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.In the title compound, C16H13BrO4, the benzene rings are almost perpendicular to each other, making a dihedral angle of 84.07 (8)°. In the crystal, the mol-ecules are linked into chains along the a axis via inter-molecular C - H?O hydrogen bonds. A C - H?? inter-action is also observed.Item 2-(4-Bromo-phen-yl)-2-oxoethyl 4-bromo-benzoate(2011) Fun, H.-K.; Arshad, S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.The asymmetric unit of the title compound, C 15H 10Br 2O 3, consists of three crystallographically independent mol-ecules (A, B and C). The phenyl rings in mol-ecules A, B and C make dihedral angles of 6.1 (3), 3.2 (2) and 54.6 (2)° to each other, respectively. In the crystal, mol-ecules are linked into two-dimensional layers parallel to the ab plane by inter-molecular C - H?O hydrogen bonds. The crystal structure is further stabilized by C - H?? inter-actions. The studied crystal is an inversion twin, the refined ratio of the twin components being 0.128 (8):0.872 (8). © Fun et al. 2011.Item 2-(4-Chloro-phen-yl)-2-oxoethyl 2,4-di-fluoro-benzoate(2011) Fun, H.-K.; Arshad, S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.The asymmetric unit of title compound, C 15H 9C lF 2O 3, consists of two crystallographically independent mol-ecules. The dihedral angle between the two terminal benzene rings in one mol-ecule is 7.92 (14)°, while that in the other mol-ecule is 73.50 (16)°. In the crystal, mol-ecules are stacked into columns along the b axis by inter-molecular C - H?O hydrogen bonds. A ?-? inter-action with a centroid-to-centroid distance of 3.747 (2) Å further stabilizes the crystal structure. © Fun et al. 2011.Item 2-(4-Bromo-phen-yl)-2-oxoethyl 2-meth-oxy-benzoate(2011) Fun, H.-K.; Ching Kheng, C.K.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.In the title mol-ecule, C 16H 13BrO 4, the dihedral angle between the benzene rings is 85.92 (10)°. In the crystal, mol-ecules are linked into chains along [100] via weak inter-molecular C - H?O hydrogen bonds. © Fun et al. 2011.Item 2-(4-Bromo-phen-yl)-2-oxoethyl 4-chloro-benzoate(2011) Fun, H.-K.; Yeap, C.S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.The asymmetric unit of the title compound, C 15H 10BrClO 3, consists of three crystallographically independent mol-ecules. The dihedral angles between the benzene rings in the three mol-ecules are 68.8 (2), 0.7 (3) and 66.1 (2)°. In the crystal, the three independent mol-ecules are inter-connected by C - H?O hydrogen bonds, leading to isolated trimers. © Fun et al. 2011.Item 2-(4-Chloro-phen-yl)-2-oxoethyl 2-meth-oxy-benzoate(2011) Fun, H.-K.; Asik, S.I.J.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.In the title compound, C 16H 13ClO 4, the two benzene rings make a dihedral angle of 86.38 (8)°. In the crystal, inter-molecular C - H?O hydrogen bonds link the mol-ecules to form columns along the a axis. The mol-ecules are also stabilized by a ?-? stacking inter-action, with a centroid-centroid distance of 3.7793 (10) Å between the inversion-related benzene rings. © Fun et al. 2011.Item 2-(4-Chloro-phen-yl)-2-oxoethyl 3-(trifluoro-meth-yl)benzoate(2011) Fun, H.-K.; Loh, W.-S.; Garudachari, B.; Isloor, A.M.; Satyanarayan, M.N.In the title compound, C 16H 10C lF 3O 3, the two benzene rings are slightly twisted from each other, with a dihedral angle of 15.50 (8)° between the planes. In the crystal, inter-molecular C - H?O hydrogen bonds link the mol-ecules into a layer parallel to the bc plane. © Fun et al. 2011.Item Fabrication of monomode channel waveguides in photosensitive polymer on optical adhesive(2011) Singhal, R.; Satyanarayan, M.N.; Pal, S.We present fabrication of optical waveguides in a photosensitive polymer. The process to fabricate monomode polymeric channel waveguides using simple direct ultraviolet (UV) photolithography is optimized. Channel waveguides of width ?2 to 2.4 ?m and height ?1.8 to 2.2 ?m are obtained on development after a crosslinkable negative tone epoxy SU-8 2002 polymer is exposed to UV through a photomask. Norland Optical Adhesive 61 (NOA 61) was used as under- and overclad. The average insertion loss obtained at chip-level is ?11 dB (TE00) and ?12 dB (TM00) for 2-cm waveguide at 1550 nm. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).