A quantitative analysis of an athermal design for a long period grating based tunable filter

Hahn, Corey; Wang, Bo; Reichard, Karl; Ditto, Dave; Glista, Drew; Wang, Qing; Yin, Shizhuo

doi:10.1016/j.optcom.2005.07.079

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The intrinsic thermal dependencies of the silica fiber and any surrounding materials should be considered when designing a device for use in an environment where the temperature is extreme and/or unstable. The authors have identified and addressed this issue in their electro-optically tunable LPG filter design [22], and other groups have also reported on temperature compensation techniques [23].…”

Section: Performance Enhancements Gained By Using An Optimized High Imentioning

confidence: 99%

Using an optimized high-index ITO overlay on a single resonant band LPG to enhance the tunable range while maintaining the resonant peak depth

Lee

Chen

Zhang

et al. 2007

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications

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In this paper, we report laboratory test results of an LPG that can maintain a constant resonant peak depth over an enhanced tuning range when it is coated with an ITO electrode that has optimized thickness and refractive index. Without the ITO layer, LPG tuning ranges as large as 50 nm have been achieved when the ambient index is increased from 1.00 (air) to ~1.444 (index of the silica cladding), but the peak depth cannot be maintained. When a properly designed, high-index ITO overlay is coated onto the silica cladding, mode transition effects coincide with the LPG's intrinsic sensitivity to changes in the ambient index, resulting in a stable peak depth over an enhanced tuning range. The authors have experimentally demonstrated an LPG coated with ITO that can be tuned in excess of 150 nm with an ambient refractive index change of less than 0.01. To the best of the authors' knowledge, this is the highest sensitivity reported for an LPG to date. In addition to the tuning performance, the resonant peak remains within 1 dB of its maximum depth for at least 100 nm of the tuning range, which allows the tunable LPG to be used in real applications.

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Section: Performance Enhancements Gained By Using An Optimized High Imentioning

confidence: 99%

Using an optimized high-index ITO overlay on a single resonant band LPG to enhance the tunable range while maintaining the resonant peak depth

Lee

Chen

Zhang

et al. 2007

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications

View full text Add to dashboard Cite

show abstract

“…The development of novel wavelength-selective optical devices enables major advances in spectroscopic methodologies and instrumentation. 1,,–16 Spectroscopies such as Raman, fluorescence, hyperspectral imaging, and pump-probe techniques require wavelength-selective optical elements that reject particular regions of the electromagnetic spectrum while transmitting adjacent spectral regions. 5,,–8,10,11,17 The recent development of highly efficient holographic filters and multilayer dielectric filters has dramatically advanced near ultraviolet (UV), visible, and near-infrared (NIR) spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

Silica Crystalline Colloidal Array Deep Ultraviolet Narrow-Band Diffraction Devices

2012

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We developed a facile method to fabricate deep ultraviolet (UV) photonic crystal crystalline colloidal array (CCA) Bragg diffraction devices. The CCAs were prepared through the self-assembly of small, monodisperse, highly surface charged silica particles (~50 nm diameter) that were synthesized by using a modified Stöber process. The particle surfaces were charged by functionalizing them with the strong acid, non-UV absorbing silane coupling agent 3-(trihydroxylsilyl)-1-propane-sulfonic acid (THOPS). These highly charged, monodisperse silica particles self assemble into a face-centered cubic CCA that efficiently Bragg diffracts light in the deep UV. The diffracted wavelength was varied between 237 nm to 227 nm by tilting the CCA orientation relative to the incident beam between glancing angles from 90° to ~66°. Theoretical calculations predict that the silica CCA diffraction will have a full width at half-maximum (FWHM) of 2 nm with a transmission of ~10(-11) at the band center. We demonstrate the utility of this silica CCA filter to reject the Rayleigh scattering in 229 nm deep UV Raman measurements of highly scattering Teflon.

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A temperature-insensitive Bragg grating sensor—Using orthogonal polarisation modes for in situ temperature compensation

Parker

Gates

Grossel

et al. 2010

Sensors and Actuators B: Chemical

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An exposed Bragg grating incorporated into a planar waveguide forms an optical device that acts as a refractive index sensor. The exposed evanescent field causes the Bragg peak to be sensitive to the refractive index of its surroundings and can be used to detect changes in this environment. The method reported is able to provide accurate temperature compensation by applying a scaling factor derived from measurement of the birefringence of the transverse electric (TE) and transverse magnetic (TM) modes of the Bragg reflection. For a fluid sensor, fluctuations in ambient temperature can be both accounted for and compensated to produce a temperature-insensitive sensor.

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A quantitative analysis of an athermal design for a long period grating based tunable filter

Cited by 5 publications

References 12 publications

Using an optimized high-index ITO overlay on a single resonant band LPG to enhance the tunable range while maintaining the resonant peak depth

Using an optimized high-index ITO overlay on a single resonant band LPG to enhance the tunable range while maintaining the resonant peak depth

Silica Crystalline Colloidal Array Deep Ultraviolet Narrow-Band Diffraction Devices

A temperature-insensitive Bragg grating sensor—Using orthogonal polarisation modes for in situ temperature compensation

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