Dr. Erden Ertorer Profile

Dr. Erden Ertorer

SPIE Involvement:

Author

Area of Expertise:

Biomedical Engineering , Photonics , Nanotechnology , Laser proccessing , Ultrafast lasers , Biosensing

Websites:

Personal Website | Company Website

I am a physicist/engineer currently working on material processing technologies with ultra-fast lasers. I did my PhD on plasmonic biosensors and nanotechnology. I am comfortable with most of the nano-micro fabrication and characterization methods, optics, plasmonics, photonics, biosensors, related chemistry as well as numerical simulations and the theory. I am also experienced on computer controlled experimental setups, their hardware and software.

Proceedings Article | 10 March 2020 Presentation

Harnessing femtosecond laser filaments for nano-structuring of "Lab-in-Fibre" sensors and "Spectrometer-in-Fibre" microsystems (Conference Presentation)

Peter Herman, Ehsan Alimonhammadian, Keivan Aghdami, Erden Ertorer, Young Hwan Kim, Jianzhao Li, Abdullah Rahnama

Proceedings Volume 11292, 1129202 (2020) https://doi.org/10.1117/12.2551249

KEYWORDS: Femtosecond phenomena, Sensors, Spectroscopy, Microsystems

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Proceedings Article | 9 March 2020 Presentation

Ultra-compact 'Spectrometer-in-Fiber' based on chirped filament-array gratings (Conference Presentation)

Abdullah Rahnama, Keivan Mahmoud Aghdami, Young Hwan Kim, Erden Ertorer, Peter Herman

Proceedings Volume 11270, 112700W (2020) https://doi.org/10.1117/12.2551025

KEYWORDS: Spectroscopy, Cladding, Light scattering, Waveguides, Spectrometers, Single mode fibers, Bragg gratings, Structured optical fibers, Optical design, Femtosecond phenomena

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Proceedings Article | 21 April 2017 Presentation

Manipulating femtosecond laser interactions in bulk glass and thin-film with spatial light modulation (Conference Presentation)

Ehsan Alimohammadian, Stephen Ho, Erden Ertorer, Sebastian Gherghe, Jianzhao Li, Peter Herman

Proceedings Volume 10094, 100940Z (2017) https://doi.org/10.1117/12.2255877

KEYWORDS: Modulation, Spatial light modulators, Thin films, Femtosecond phenomena, Glasses, Beam shaping, Waveguides, Optical tracking, Spherical lenses, Plasma

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Spatial Light Modulators (SLM) are emerging as a power tool for laser beam shaping whereby digitally addressed phase shifts can impose computer-generated hologram patterns on incoming laser light. SLM provide several additional advantages with ultrashort-pulsed lasers in controlling the shape of both surface and internal interactions with materials. Inside transparent materials, nonlinear optical effects can confine strong absorption only to the focal volume, extend dissipation over long filament tracks, or reach below diffraction-limited spot sizes. Hence, SLM beam shaping has been widely adopted for laser material processing applications that include parallel structuring, filamentation, fiber Bragg grating formation and optical aberration correction.

This paper reports on a range of SLM applications we have studied in femtosecond processing of transparent glasses and thin films. Laser phase-fronts were tailored by the SLM to compensate for spherical surface aberration, and to further address the nonlinear interactions that interplay between Kerr-lens self-focusing and plasma defocusing effects over shallow and deep focusing inside the glass. Limits of strong and weak focusing were examined around the respective formation of low-loss optical waveguides and long uniform filament tracks. Further, we have employed the SLM for beam patterning inside thin film, exploring the limits of phase noise, resolution and fringe contrast during interferometric intra-film structuring.

Femtosecond laser pulses of 200 fs pulse duration and 515 nm wavelength were shaped by a phase-only LCOS-SLM (Hamamatsu X10468-04). By imposing radial phase profiles, axicon, grating and beam splitting gratings, volume shape control of filament diameter, length, and uniformity as well as simultaneous formation of multiple filaments has been demonstrated. Similarly, competing effects of spherical surface aberration, self-focusing, and plasma de-focusing were studied and delineated to enable formation of low-loss optical waveguides over shallow and deep focusing conditions.

Lastly, SLM beam shaping has been successfully extended to interferometric processing inside thin transparent film, enabling the arbitrary formation of uniform or non-uniform, symmetric or asymmetric patterns of flexible shape on nano-scale dimensions without phase-noise degradation by the SLM patterning. We present quantized structuring of thin films by a single laser pulse, demonstrating λ/2nfilm layer ejection control, blister formation, nano-cavities, and film colouring. Closed intra-film nanochannels with high aspect ratio (20:1) have been formed inside 3.5 um thick silica, opening new prospects for sub-cellular studies and lab-in-film concepts that integrate on CMOS silicon technologies.

Proceedings Article | 21 April 2017 Presentation

Femtosecond filaments for rapid and flexible writing of Fiber-Bragg grating (Conference Presentation)

Erden Ertorer, Moez Haque, Jianzhao Li, Peter Herman

Proceedings Volume 10094, 1009415 (2017) https://doi.org/10.1117/12.2257545

KEYWORDS: Refractive index, Optical fibers, Cladding, Fiber Bragg gratings, Laser processing, Glasses, Laser glasses, Single mode fibers, Waveguides, Femtosecond phenomena

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Proceedings Article | 3 March 2014 Paper

Three dimensional metallic nanostructures for bulk and bio-SPR sensing applications

Mohamadreza Najiminaini, Erden Ertorer, Hao Jiang, Bozena Kaminska, Silvia Mittler, Jeffrey J. Carson

Proceedings Volume 8957, 89570I (2014) https://doi.org/10.1117/12.2036761

KEYWORDS: Nanostructures, Gold, Refractive index, Absorption, Surface plasmons, Transmittance, 3D surface sensing, Biosensing, Electron beam lithography, Dielectrics

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SPIE Journal Paper | 4 March 2013 Open Access

Large area periodic, systematically changing, multishape nanostructures by laser interference lithography and cell response to these topographies

Erden Ertorer, Fartash Vasefi, Joel Keshwah, Mohamadreza Najiminaini, Christopher Halfpap, Uwe Langbein, Jeffrey Carson, Douglas Hamilton, Silvia Mittler

JBO, Vol. 18, Issue 03, 035002, (March 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.3.035002

KEYWORDS: Nanostructures, Photoresist materials, Nanolithography, Interferometers, Mirrors, Scanning electron microscopy, Silicon, Lithography, Glasses, Ions

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