Digital optical spectrometer-on-chip

Babin, S.; Bugrov, A. É.; Cabrini, Stefano; Dhuey, Scott; Goltsov, A.; Ivonin, Igor; Kley, E.‐B.; Péroz, Christophe; Schmidt, Holger; Yan'kov, V. V.

doi:10.1063/1.3190199

Cited by 39 publications

(16 citation statements)

References 5 publications

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“…A photodetector array probes the spatial field distribution and converts it into spectral information of the optical input via a linear transformation. Classical dispersive spectrometers using diffractive gratings, prisms, or resonant cavity arrays as the spectrum-splitting elements fall in this category [5][6][7][8][9][10][11][12][13] . Furthermore, the generalized "dispersive" spectrometers shown in Fig.…”

Section: Performance Scaling In Chip-scale Spectroscopic Sensing Systemsmentioning

confidence: 99%

On-chip infrared sensors: redefining the benefits of scaling

et al. 2017

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Infrared (IR) spectroscopy is widely recognized as a gold standard technique for chemical and biological analysis.Traditional IR spectroscopy relies on fragile bench-top instruments located in dedicated laboratory settings, and is thus not suitable for emerging field-deployed applications such as in-line industrial process control, environmental monitoring, and point-of-care diagnosis. Recent strides in photonic integration technologies provide a promising route towards enabling miniaturized, rugged platforms for IR spectroscopic analysis. It is therefore attempting to simply replace the bulky discrete optical elements used in conventional IR spectroscopy with their on-chip counterparts. This size down-scaling approach, however, cripples the system performance as both the sensitivity of spectroscopic sensors and spectral resolution of spectrometers scale with optical path length. In light of this challenge, we will discuss two novel photonic device designs uniquely capable of reaping performance benefits from microphotonic scaling. We leverage strong optical and thermal confinement in judiciously designed micro-cavities to circumvent the thermal diffusion and optical diffraction limits in conventional photothermal sensors and achieve a record 104 photothermal sensitivity enhancement. In the second example, an on-chip spectrometer design with the Fellgett's advantage is analyzed. The design enables sub-nm spectral resolution on a millimeter-sized, fully packaged chip without moving parts.

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Section: Performance Scaling In Chip-scale Spectroscopic Sensing Systemsmentioning

confidence: 99%

On-chip infrared sensors: redefining the benefits of scaling

et al. 2017

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“…12 The DPH is etched into the core layer of a planar waveguide in order to produce a spatial modulation of the effective refractive index of the waveguide and to control the propagation of the light at the nanoscale. 12 The DPH is etched into the core layer of a planar waveguide in order to produce a spatial modulation of the effective refractive index of the waveguide and to control the propagation of the light at the nanoscale.…”

Section: Device Fabricationmentioning

confidence: 99%

“…9,10 In particular, a powerful technology based on the concept of CGWH is digital planar holography (DPH), 11,12 which allows for the encoding of the optical transfer function of the desired device into a planar hologram engraved in the core layer of a dielectric slab waveguide. A promising approach for the design of photonic devices is computer-generated waveguide holography (CGWH).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of digital planar holograms into high refractive index waveguide core for spectroscopy-on-chip applications

Calò

Lacatena

Dhuey

et al. 2012

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Fabrication and optical measurements of germanium-doped silica ridge waveguides using a colloidal suspension approach Appl. Phys. Lett. 87, 121114 (2005); 10.1063/1.2037863Plasma silicon oxide-silica xerogel based planar optical waveguides A novel class of large-bandwidth wavelength demultiplexers, based on digital planar holography for on-chip spectroscopy applications, was fabricated in high refractive index contrast SiO 2 /Si 3 N 4 planar waveguides. The devices consist of computer-generated digital planar holograms (DPHs) encoding the transfer function of the demultiplexers, engraved on the core layer of the optical waveguide. An optimized fabrication process has been developed to produce DPHs with an etching depth as low as 10 nm in Si 3 N 4 . The first spectrometer devices exhibit overall bandwidths as large as 98 nm and spectral channel spacings down to 0.3 nm/channel.

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“…Spectral filters that selectively reflect or transmit the incident light are indispensable in various optical devices including spectrum analyzers, image sensors and wavelength demultiplexers. In a wide class of planar (integrated) optoelectronic systems, spectral or spatial filtering is performed in a slab waveguide [1][2][3][4][5][6][7]. Such geometry corresponds to the "insulator-oninsulator" platform and is suitable for the creation of fully integrated optical devices.…”

Section: Introductionmentioning

confidence: 99%

Integrated flat-top reflection filters operating near bound states in the continuum

Doskolovich¹,

Bezus²,

Bykov³

2019

Photon. Res.

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We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum (BIC) and enable spectral filtering of transverse-electric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing the structure size. In addition to the filtering properties, the investigated structures support another type of BICs -Fabry-Pérot BICs arising when the distances between the adjacent ridges meet the Fabry-Pérot resonance condition. In the vicinity of the Fabry-Pérot BICs, an effect similar to the electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip.

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Digital optical spectrometer-on-chip

Cited by 39 publications

References 5 publications

On-chip infrared sensors: redefining the benefits of scaling

On-chip infrared sensors: redefining the benefits of scaling

Fabrication of digital planar holograms into high refractive index waveguide core for spectroscopy-on-chip applications

Integrated flat-top reflection filters operating near bound states in the continuum

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