Ultra-Broadband Confinement in Deep Sub-Wavelength Air Hole of a Suspended Core Fiber

Hasan, Dihan; Alam, M. Shah

doi:10.1109/jlt.2014.2306292

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…We are concerned about exploiting the input/output coupling proficiency to such various structures and exploring the feasibility that similar design strategies may further enhance their optical power delivery performance. Also, we are assertive that optimizing such systems by utilizing our analytical approach can enlarge the evanescent field's magnitude, unifying the juncture of employing fibers with the suspended-core [94]. We believe that our introduced model can offer great potentiality for evanescent sensing applications; moreover, it furnishes outstanding futuristic research obligations.…”

Section: Discussionmentioning

confidence: 89%

“…We have tabulated the typical values of overlapping factor (%) for airand-water-filled configurations of hexagonal P-MOF (see Table 2). It is worth highlighting that the sample to be studied is explored through the evanescent field, which falls significantly from the fiber surface; therefore, the measurand can be sensed near the interface of holes (or even deployed as a thin layer) [92][93][94]. Thus, it is anticipated that a well-designed WF-configuration with high OF and low loss can directly improve the sensitivity and the optical power requirement.…”

Section: Water-filled Configurationmentioning

confidence: 99%

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One-rod core microstructured optical fibers for evanescent sensing applications: an alternative approach

Sharma

Tripathi

2021

Preprint

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The advent of polymer (or plastic) optical fibers (POFs) with porous cross-section has contributed significantly to the sensing applications. We intend to explore the sensing attributes of polymer-based one-rod core microstructured optical fibers (P-MOFs) via utilizing an auxiliary approach. The sensitivity coefficient and the overlapping factor of P-MOF’s introduced design in air-filled and water-filled layouts against the structural parameters are exploited. We reported the overlapping factor of ~ 94% and ~ 82% for the said configurations of the fibers, respectively, at the wavelength of 0.633 µm. The confinement loss, mode-index, and effective mode-area are also evaluated for the anticipated structures. For assessing the confinement loss, an alternative approach based on double-clad fiber (DCF) approximation is employed. The validity of the simulated results is scrutinized with those as documented in the literature. Relative errors are also tabulated.

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Section: Discussionmentioning

confidence: 89%

Section: Water-filled Configurationmentioning

confidence: 99%

One-rod core microstructured optical fibers for evanescent sensing applications: an alternative approach

Sharma

Tripathi

2021

Preprint

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“…Although the reversible nature of the intensity variation strongly indicates the dominant influence of the optical properties over the nanometric structural change at a moderately heated condition, mismatch of mechanical properties among different layers can be potentially vulnerable for the reliability of the device over multiple cycles or in rather harsh conditions. Hence, we also highlight such mismatch and study the spatial distribution of the thermal stress using 3D FEM in the supplementary information (Figure S7) 40 .…”

Section: Results and Analysismentioning

confidence: 99%

Thermoplasmonic Study of a Triple Band Optical Nanoantenna Strongly Coupled to Mid IR Molecular Mode

Hasan

Pitchappa

et al. 2016

Sci Rep

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We report the first thermal study of a triple band plasmonic nanoantenna strongly coupled to a molecular mode at mid IR wavelength (MW IR). The hybrid plasmonic structure supports three spatially and spectrally variant resonances of which two are magnetic and one is dipolar in nature. A hybridized mode is excited by coupling the structure’s plasmonic mode with the vibrational mode of PMMA at 5.79 μm. Qualitative agreement between the spectral changes in simulation and experiment clearly indicates that resistive heating is the dominant mechanisms behind the intensity changes of the dipolar and magnetic peaks. The study also unveils the thermal insensitivity of the coupled mode intensity as the temperature is increased. We propose a mechanism to reduce the relative intensity change of the coupled mode at elevated temperature by mode detuning and surface current engineering and demonstrate less than 9% intensity variation. Later, we perform a temperature cycling test and investigate into the degradation of the Au-PMMA composite device. The failure condition is identified to be primarily associated with the surface chemistry of the material interface rather than the deformation of the nanopatterns. The study reveals the robustness of the strongly coupled hybridized mode even under multiple cycling.

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realizing the aforementioned applications in a broad wavelength range starting from the visible to microwave spectrum. [15][16][17][18][19][20][21][22][23][24][25][26] However, large scale application of plasmonic metamaterial is strongly dependent on both the scalability and repeatability of the fabrication process which can be reasonably ensured in CMOS technology. [15][16][17][18][19][20][21][22][23][24][25][26] However, large scale application of plasmonic metamaterial is strongly dependent on both the scalability and repeatability of the fabrication process which can be reasonably ensured in CMOS technology.

…”

mentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14] Thanks to the pioneering role of nanotechnology, complicated plasmonic architectures with multifunctionalities have been already demonstrated. [15][16][17][18][19][20][21][22][23][24][25][26] However, large scale application of plasmonic metamaterial is strongly dependent on both the scalability and repeatability of the fabrication process which can be reasonably ensured in CMOS technology. Very recently, CMOS fabricated designer optical structures have been reported to achieve high Q Fabry-Pérot resonance for gas sensing, [27,28] MEMS tunable metamaterials for terahertz communication, [29,30] and switchable mid-IR absorber [31] while relying on a fairly challenging process flow.…”

mentioning

confidence: 99%

High Temperature Coupling of IR Inactive CC Mode in Complementary Metal Oxide Semiconductor Metamaterial Structure

Hasan

Pitchappa

et al. 2017

Advanced Optical Materials

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realizing the aforementioned applications in a broad wavelength range starting from the visible to microwave spectrum. [7][8][9][10][11][12][13][14] Thanks to the pioneering role of nanotechnology, complicated plasmonic architectures with multifunctionalities have been already demonstrated. [15][16][17][18][19][20][21][22][23][24][25][26] However, large scale application of plasmonic metamaterial is strongly dependent on both the scalability and repeatability of the fabrication process which can be reasonably ensured in CMOS technology. Very recently, CMOS fabricated designer optical structures have been reported to achieve high Q Fabry-Pérot resonance for gas sensing, [27,28] MEMS tunable metamaterials for terahertz communication, [29,30] and switchable mid-IR absorber [31] while relying on a fairly challenging process flow. A recent paradigm shift in the field of nanophotonic and metamaterial research is the increasing investigation of phonon modes in bulk and 2D form [32,33] especially in the mid-IR domain (3-8 µm), the primary motivation being arose by the low loss and multifunctional nature of these modes. Under CMOS consideration, such mode has been explored in SiO 2 thin film originating from the SiO and SiD vibration. [34] However, all infrared (IR) phonon modes in bulk form reported so far are intrinsically active with net dipole moment due to the polar nature of the dielectric and investigation into IR inactive modes with no net dipole moment needs to be carried out. On the other hand, due to the electrical characteristic of vibrations, the IR activity and Raman activity are complementary to each other, meaning an IR inactive mode becomes Raman active and vice versa. [35] One example of strongly IR inactive mode is the sp 2 -hybridized >CC< vibration. [36] Interestingly, such IR inactivity can be theoretically broken by causing asymmetry into the >CC< bond and inducing the net dipole moment in the oscillator. Infrared observation of Raman-active G band and D band has been reported in fact by symmetry breaking in nitrogen doped amorphous carbon. [37] In this work, however, we consider carbon rich SiO 2 thin film obtained by tetraethyl orthosilicate (TEOS)-based chemical vapor deposition (CVD) and report unusual switching behavior of the >CC< bands being strongly dependent on temperature. We further leverage such thermally induced asymmetry driven excitation of IR inactive mode in CMOS dielectric and couple it into the CMOS metamaterial structures as a means of thermal modulation of their resonance spectra. We High temperature (up to 400 °C) coupling of infrared (IR) inactive >CC< mode is reported in complementary metal oxide semiconductor (CMOS)-compatible refractory metamaterial filter and absorber structure by leveraging the carbon defects in tetraethyl orthosilicate obtained plasma enhanced chemical vapor deposition SiO 2 thin film. Here, the role of strain gradient induced dipole moment in high stress configuration on the activation of otherwise inactive >CC< vibration at IR is confirmed. The ...

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Ultra-Broadband Confinement in Deep Sub-Wavelength Air Hole of a Suspended Core Fiber

Cited by 14 publications

References 22 publications

One-rod core microstructured optical fibers for evanescent sensing applications: an alternative approach

One-rod core microstructured optical fibers for evanescent sensing applications: an alternative approach

Thermoplasmonic Study of a Triple Band Optical Nanoantenna Strongly Coupled to Mid IR Molecular Mode

High Temperature Coupling of IR Inactive CC Mode in Complementary Metal Oxide Semiconductor Metamaterial Structure

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