28 research outputs found
Optik biyo-tespit uygulamaları amacıyla tasarlanmış tek boyutlu yarık modlu fotonik kristal kavite.
No full textIn this thesis, we presented a refractive index based optical bio-sensor, utilizing a slot mode one dimensional photonic crystal cavity as a transducing element. We benefited from the suitability of slotted one dimensional photonic crystal cavities for optical bio-sensing applications, owing to their capability of confining the light strongly in the low dielectric media. We described the theory behind the design, and also provided numerical analyses, characterizing the device performance. We also demonstrated a performance enhancement method, relying on an optomechanical feedback loop, which can enhance both the quality factor and the sensitivity of the resonant cavity. The enhancement mechanism is triggered when the target analyte enters the background medium and modifies the cavity slot width, by benefiting from the optical transverse gradient forces inside the cavity. By the help of the optomechanical feedback loop, the intrinsic trade-off between the performance factors can be eliminated, resulting in an improved figure of merit. In the thesis, we demonstrated the operation principle of the enhancement method, together with the numerical calculations necessary for the investigation of the level of enhancement. Our optomechanical feedback loop can be appended to any resonant structure vi without any modification, proposing a strong potential for our enhancement method to be utilized in other refractive index based optical bio-sensing schemes.Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering
A ONE DIMENSIONAL SLOT MODE PHOTONIC CRYSTALNANOBEAM CAVITY DESIGN FOR OPTICAL BIO-SENSINGAPPLICATIONS
No full textIn this thesis, we presented a refractive index based optical bio-sensor, utilizing a slot mode one dimensional photonic crystal cavity as a transducing element. We benefited from the suitability of slotted one dimensional photonic crystal cavities for optical bio-sensing applications, owing to their capability of confining the light strongly in the low dielectric media. We described the theory behind the design, and also provided numerical analyses, characterizing the device performance. We also demonstrated a performance enhancement method, relying on an optomechanical feedback loop, which can enhance both the quality factor and the sensitivity of the resonant cavity. The enhancement mechanism is triggered when the target analyte enters the background medium and modifies the cavity slot width, by benefiting from the optical transverse gradient forces inside the cavity. By the help of the optomechanical feedback loop, the intrinsic trade-off between the performance factors can be eliminated, resulting in an improved figure of merit. In the thesis, we demonstrated the operation principle of the enhancement method, together with the numerical calculations necessary for the investigation of the level of enhancement. Our optomechanical feedback loop can be appended to any resonant structure vi without any modification, proposing a strong potential for our enhancement method to be utilized in other refractive index based optical bio-sensing schemes
Breaking the trade-off between Q-factor and sensitivity for high-Q slot mode photonic crystal nanobeam cavity biosensors with optomechanical feedback
No full textHere, a method to eliminate the trade-off between quality factor (Q-factor) and sensitivity of a one dimensional slot mode photonic crystal nanobeam cavity biosensor is presented. Applied method utilizes an optomechanical feedback mechanism in order to generate transverse gradient optical forces inside the cavity. A pump mode is utilized in order to generate the optical force, triggered by intrusion of analyte into the background medium. The amount of generated force is controlled via an interference mechanism at the output realized by the feedback loop. By utilizing created optical force, slot width of the nanobeam cavity is dynamically tuned and the quality factor degradation due to the decrease in the refractive index contrast of the cavity is compensated by enhancing the field confinement inside the cavity. With the contribution of the slot width tuning to the resonant wavelength shift, sensitivity of the biosensor is increased without any degradation of the Q-factor. Numerical analyses regarding the cavity design and the elimination of trade-off are provided. Obtained results show that the both performance can be increased at the same time
Optomechanically Enhanced High-Q Slot Mode Photonic Crystal Nanobeam Cavity
No full textA high-Q slot mode photonic crystal nanobeam cavity based biosensor design with positive optomechanical feedback is presented. Detailed analysis of sensitivity enhancement due to feedback shows a fourfold improvement without any compromise in quality factor
Optomechanically Enhanced High-Q Slot Mode Photonic Crystal Nanobeam Cavity
No full textA high-Q slot mode photonic crystal nanobeam cavity based biosensor design with positive optomechanical feedback is presented. Detailed analysis of sensitivity enhancement due to feedback shows a fourfold improvement without any compromise in quality factor
Erratum to: Exciton recycling via InP quantum dot funnels for luminescent solar concentrators (Nano Research, (2021), 14, 5, (1488-1494), 10.1007/s12274-020-3207-9)
No full textThe article “Exciton recycling via InP quantum dot funnels for luminescent solar concentrators” written by Houman Bahmani Jalali1,§, Sadra Sadeghi2,§, Isinsu Baylam3,4, Mertcan Han5, Cleva W. Ow-Yang6, Alphan Sennaroglu3,4, and Sedat Nizamoglu1,2,5 (✉), was originally published Online First without Open Access. After publication online first, the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2020 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The original article has been corrected
Erratum to: Exciton recycling via InP quantum dot funnels for luminescent solar concentrators (Nano Research, (2020), 10.1007/s12274-020-3207-9)
No full textThe article “Exciton recycling via InP quantum dot funnels for luminescent solar concentrators” written by Houman Bahmani Jalali1,§, Sadra Sadeghi2,§, Isinsu Baylam3,4, Mertcan Han5, Cleva W. Ow-Yang6, Alphan Sennaroglu3,4, and Sedat Nizamoglu1,2,5 (✉), was originally published Online First without Open Access. After publication online first, the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2020 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The original article has been corrected
High-Q Slot-Mode Photonic Crystal Nanobeam Cavity Biosensor With Optomechanically Enhanced Sensitivity
No full textA biosensor design based on a photonic crystal nanobeam cavity with an optomechanical positive feedback mechanism is proposed. Design of the cavity and optomechanical sensitivity enhancement method are numerically analyzed and the results show that fourfold improvement is possible without any degradation of the Q-factor
A 2D Slotted Rod Type PhC Cavity Inertial Sensor Design for Impact Sensing
No full textA tunable 2D rod type Si Photonic Crystal cavity based impact sensing configuration is proposed and numerically analyzed. The cavity is sandwiched by perfect electric conductor (PEC) boundaries in order to provide out-of-plane light confinement. An on-purpose air slot is introduced between the Si rods and top PEC plate moving the light confinement into the slotted region and making the cavity highly responsive to the displacement of top PEC boundary. Optomechanical coupling strength is calculated to be on the order of 300 GHz/nm. Proposed light confinement inside the slot shows similar characteristics to slot waveguiding phenomenon and offers valuable opportunities for mechanical sensing applications. For a practical approach, PEC boundaries are replaced by Gold plates and the potential of the structure as an inertial sensor is investigated with a specific focus on impact sensing applications to be used in automotive security systems. Numerical analyses indicate that the device, whose sensing area is only 106.6 mu m2, has a response time of 16.6 mu s asserting that the proposed sensor can sense the presence of an impact faster than several commercially available ones, in a much more compact form
Tunable integrated optical modulator with dynamical photonic band transition of photonic crystals
No full text
