Diffraction grating structures resonances

Sensors Based on Resonances in Diffraction Grating Structures. 81... 

Usually, there are two ways of optical excitation to achieve the resonant condition total refiection in prism-coupler structures [12] and diffraction at diffraction gratings [13]. The most commonly used is the first one due to its simplicity, and it is called the Kretschmann configuration, already shown in Fig. 5.5a. 

Diffraction gratings are the basic building block for many photonic structures important for passive and active devices. They exhibit sharp resonances from 1902 called Wood anomalies [21]. There was a debate from 1902 on the nature... 

Ruminski AM, Secret E, Sailor MJ (2008) Chemical sensors based on resonant diffraction gratings made of porous silicon imprinted with a silicone polymer. In Canham LT et al (eds) Porous semiconductor science and technology, Mallorca pp 113-114 Ryckman JD, Liscidini M, Sipe JE, Weiss SM (2010a) Porous sihcon structures for low-cost diffraction-based biosensing. Appl Phys Lett 96(17) 171103 Ryckman JD, Liscidini M, Sipe JE, Weiss SM (2010b) Diffraction based biosensing with porous silicon. In Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science conference (QELS), 2010 conference on Lasers and Electro-Optics, San Jose, Cabfomia United States, pp 1-2... 

The basic structure of the GMR device is shown in Fig. 3, where the grating layer is on top of the waveguide layer and the top layer could be the analyte material filling both the spaces between the grating lines and the space above the gratings. A cavity is formed [36, 37] for the diffracted order and a reflection resonance is obtained when the phase difference between the transmitted and reflected waves is multiple of %. To show this, we start from the grating equation ... 

The measurements done by Guo et al. [25] showed decay in the enhancement beyond approximately 80 nm. Their FDTD calculations instead showed a continued oscillation in the average field-squared at the position of the fluors out to at least 600 nm these oscillations correlate with Fabry-Perot resonances within the oxide, an observation which has been made previously by Andrewartha [59] for a similar type of structure (a "bottle grating interestingly calculations of the reflectivity from this related structure showed similar sharp oscillations [59]. The calculated oscillations originate from the interference between diffraction from the nanowire array and multiple reflections from the aluminum... 

---