Improved transmission and thermal emission in macroporous silicon photonic crystals with 700 nm pitch

Cardador, D.; Segura, D.; Vega, Davide; Rodriguez, A.

doi:10.1109/cde.2017.7905209

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…On the other hand, vertical period deviations result, mainly, in a significant bandgap reduction as well as a smoothing of the PhC optical response. However, this works are not able to explain the previously reported large differences in transmittance, and its wavelength dependence, between simulations and measurements [5]- [7]. As the reduction of periodicity is one of the future goals of MPS PhC technology, high absorption losses in short wavelengths could limit the development and establishment of this technology.…”

mentioning

confidence: 74%

“…In them, simulated and experimental results reasonably agree for wavelengths longer than those corresponding to the bandgap frequency, however, for shorter wavelengths, transmittance drops fast and the agreement between measurements and simulations is Absorption mechanisms in macroporous silicon photonic crystals Daniel Segura García, David Cardador Maza, Jordi Llorca, Ángel Rodríguez Martínez, Senior Member, IEEE M particularly poor. In the case of PhCs with smaller periodicity -p = 700 nm-, the reported transmittance values are far from FDTD simulations in the whole wavelength range [5]- [7], see Fig. 1Error!…”

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confidence: 84%

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Absorption mechanisms in macroporous silicon photonic crystals

García

Maza

Rodriguez

et al. 2020

Sensors and Actuators A: Physical

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confidence: 74%

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confidence: 84%

Absorption mechanisms in macroporous silicon photonic crystals

García

Maza

Rodriguez

et al. 2020

Sensors and Actuators A: Physical

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“…It was possible to fine-tune the structure towards narrow-band emission by converting the 2D photonic crystal structure into a 3D photonic crystal structure. Cardador et al [80] reported 3D photonic crystal structures on amorphous silicon that could be used as a filter to filter a broad-band emitter to achieve narrow-band emission. Transmission of the desired wavelength (4.6 µm) was increased from 4% -6% to 25 % -30 % by reducing the thickness of the substrate by 160 µm.…”

Section: Plasmonic Ir Emittersmentioning

confidence: 99%

All-Dielectric Metasurface Thermal Emitters for Mid-Ir Spectroscopy

Ali¹

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A thermal emitter using a metasurface to tailor the emission spectrum in the mid-infrared for gassensing applications is demonstrated. The design consists of an array of high index dielectric elliptical pucks above a metal back-reflector. Using full-wave simulations in HFSS (Ver. 19.0.0), it has been shown that the achievable Q-factor (Q ≈ 150) in this structure is an order of magnitude larger than in plasmonic arrays (Q ≈ 16), attributed to the low-loss in the dielectric materials. Furthermore, the thermal emission properties of the structure can be engineered by manipulating Accomplishment of my thesis would not have been possible without the support of a few special people. I would like to acknowledge and thank my thesis supervisors Dr. Niall Tait and Dr. Shulabh Gupta from the bottom of my heart for providing consistent support and encouragement to complete this task. Specially going through and fixing the multiple drafts of my thesis and help with the journal papers. This project involved a lot of nanofabrication which is time consuming and requires a lot of expertise in terms of equipment usage and experience. I would like to extend my sincere thanks to Robert Vandusen, Angela M. Williams and Rodney Aiton for their continuous support during fabrication failures and encouragement and appreciation on my successes. I would like to specially thank Nagui Mikhail for helping me specially when it came to simulation and technical support related to my project. Thanks to the Department of Electronics Engineering, particularly Nagui Mikhail, Blazenka Power, Anna Lee and Valerie Daley for their help. I would like to extend gratitude to my close friend Muhammad Asif for being my continuous support during this project. His words of encouragement and advises throughout my stay in Ottawa helped me navigate the highs and lows of my academic journey. I would also like to thank my dear friend Raheel Ahmed for his help and support towards the completion of my project. I would specifically like to acknowledge his mastery on graphical designing software that helped me in translating my fabricated devices into figures. My deepest thanks goes to my family for being my continuous support in this journey. My Wife, Naureen Aqueel was always there to help me specially raising our two sons Muhammad Abdurrahman Ali and Muhammad Yasir Ali while I was working late hours at Carleton University working on my projects and writing my thesis. She was my constant support and encouragement and believed in me for successful completion of my project.

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High-Q all-dielectric thermal emitters for mid-infrared gas-sensing applications

2017

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A simple all-dielectric thermal emitter unit cell for narrowband gas-sensing application is proposed, providing large Q-factors compared to its plasmonic counterpart. It consists of a high-index dielectric-based elliptical puck on top of a back-reflector, providing narrowband thermal emission. Using full-wave simulations, it is demonstrated that the achievable Q-factors in this structure are orders of magnitude larger than what have been shown for plasmonic cells, thanks to their low-loss electrical characteristics. Furthermore, the thermal emission properties can be engineered by manipulating the geometry of the unit cell, whereby it is shown that these unit cells can provide polarized thermal emission simultaneously in two separate frequency bands, with identical Q-factor characteristics, depending on their ellipticity parameter.

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Improved transmission and thermal emission in macroporous silicon photonic crystals with 700 nm pitch

Cited by 4 publications

References 12 publications

Absorption mechanisms in macroporous silicon photonic crystals

Absorption mechanisms in macroporous silicon photonic crystals

All-Dielectric Metasurface Thermal Emitters for Mid-Ir Spectroscopy

High-Q all-dielectric thermal emitters for mid-infrared gas-sensing applications

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