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IEEE Photonics Technology Letters
Journal Prestige (SJR): 0.961

Citation Impact (citeScore): 3
Number of Followers: 14

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1041-1135
Published by IEEE

[228 journals]

Deep Subwavelength Anti-Slot Photonic Crystals Fabricated in Monolithic
Silicon Photonics Technology
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  Authors: J. A. Allen;K. P. Arnold;S. I. Halimi;L. D. Ryder;F. O. Afzal;Y. Bian;A. Aboketaf;K. Dezfulian;M. Rakowski;R. Augur;T. Hirokawa;K. Nummy;Sharon M. Weiss;
  Pages: 461 - 464
  Abstract: We report the scalable fabrication and characterization of photonic crystal (PhC) nanobeam waveguides incorporating subwavelength-scale dielectric anti-slot unit cells. These anti-slot PhCs were fabricated using deep UV lithography on a monolithic silicon photonics technology. The dielectric band edge mode is characterized by strong field localization in the anti-slot region where the minimum dielectric feature size is approximately 70 nm. This demonstration opens the door to further investigation of subwavelength engineered photonic structures fabricated using commercial foundry processes for integrated photonics applications that benefit from enhanced light-matter interaction.
  PubDate: May1, 1 2023
  Issue No: Vol. 35, No. 9 (2023)
2Serial-2Parallel Optical DAC for High-Resolution Photonic-Efficient
Energy-Efficient 4 16 64 256 QAM
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  Authors: Moshe Nazarathy;Ioannis Tomkos;
  Pages: 465 - 468
  Abstract: Next upgrade to QAM256 poses formidable barriers in terms of attainable performance and energy-efficiency of DAC driver + MZM based Transmitters (Tx). A promising alternative, potentially changing the ‘rules of the game’ is optical DACs (oDAC). In previous work, we proposed a PAM4-driven optical Tx generating up to 256QAM. Here we introduce a novel oDAC parallelizing a pair of optimized 2-segment MZMs, remarkably fed by 4 uncoupled NRZ signals. Based on a pair of IQ-nested new oDACs, the resulting DAC-less QAM Tx is fed by 8 uncoupled NRZ drivers. The energy efficiency, photonic efficiency and resolution of the flexible oDAC and QAM Tx are at their utmost.
  PubDate: May1, 1 2023
  Issue No: Vol. 35, No. 9 (2023)
Optical Fiber Axicon Enabled Plasmofluidic Trapping: Sensing With Enhanced
Figure of Merit
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  Authors: Riya Choudhary;Kulwinder Kaur Sarao;Samir K. Mondal;Sachin K. Srivastava;
  Pages: 469 - 472
  Abstract: In this letter, trapping of colloidal gold nanoparticles (AuNPs) using an optical fiber axicon, and its use in plasmon-enhanced sensing have been reported. The AuNPs of 40 nm size were trapped in a Bessel beam from an optical fiber negative axicon coupled with a laser of 532 nm wavelength. The fluorescence signal from a mixture of AuNPs and Rhodamine 6G (Rh6G) of varying concentrations was studied on a custom-made optical setup. Control experiments on an optical fiber with Gaussian beam illumination, and on NPs of varying sizes were performed to achieve optimal performance. An overall plasmonic enhancement factor of $10^{3}$ per molecule in the fluorescence signal was estimated. A performance enhancement of about 480 times was achieved through trapping, as compared to normal optical fiber illumination. A limit of detection (LoD) of 10 ng/ml of Rh6G was achieved. This study is useful in the development of application-specific metasurfaces, and biosensors using structured beam illumination of plasmonic-fluids. This study also shows that structured illumination can lead to manifold increase in plasmon enhanced fluorescence signal.
  PubDate: May1, 1 2023
  Issue No: Vol. 35, No. 9 (2023)

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