Photonic crystal spectrometer

Abstract

Abstract:We demonstrate a new kind of optical spectrometer employing photonic crystal patterns to outcouple waveguided light from a transparent substrate. This spectrometer consists of an array of photonic crystal patterns, nanofabricated in a polymer on a glass substrate, combined with a camera. The camera captures an image of the light outcoupled from the patterned substrate; the array of patterns produces a spatially resolved map of intensities for different wavelength bands. The intensity map of the image is converted into a spectrum using the photonic crystal pattern response functions. We present a proof of concept by characterizing a white LED with our photonic crystal spectrometer.

Photonic crystals for the application to spectrometers and wavelength filters

“…Out-of-plane type PhC spectrometers and sensors are based on this principle. The group at Columbia University demonstrated 9-ch spectrometer at visible wavelength [33]. They created 2-D PhC GC with different lattice constant and extracted signal light of different wavelengths as shown in Fig.…”

“…3. Schematic of spatially resolved, wavelengthselective outcoupling of waveguided light using an array of PhCs [33]. Copyright: 2010 Optical Society of America.…”

Holographic planar lightwave circuit for on-chip spectroscopy

“…Conversely, spectrometers based on microelectromechanical systems, 21 filter arrays of Fabry-Perot cavities 22 and particular types of arrayed photonic crystals 23,24 exhibit broad spectral ranges but have a poor resolution. Each of the aforementioned approaches is also not sufficiently resilient to fabrication errors.…”

High-resolution optical spectroscopy using multimode interference in a compact tapered fibre

“…In recent years, there has been a strong effort to develop novel spectrometers that are compact and have high resolving powers and operational bandwidths 5,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] . In addition to miniature grating spectrometers 12 , resonant structures such as nanocavities [13][14][15][16][17][18] have also been employed to separate spectral components into unique detectors.…”

“…In addition to miniature grating spectrometers 12 , resonant structures such as nanocavities [13][14][15][16][17][18] have also been employed to separate spectral components into unique detectors. This research has produced millimetre-scale spectrometers with high resolving powers of R410 4 , but with limited fractional bandwidth,…”