Multiline two-dimensional guided-mode resonant filters

Abstract

A novel multiline filter using a two-dimensional guided-mode resonant (GMR) filter is proposed. The filter concept utilizes the multiple planes of diffraction produced by the two-dimensional grating. Multiple resonances are obtained by matching the guided modes in the different planes of diffraction to different wavelengths. It is shown that the location and the separation between resonances can be specifically controlled by modifying the periodicity of the grating and the other physical dimensions of the structure. This is in contrast to the one-dimensional GMR filters where the location of the resonances is material dependent. Two-line reflection filter designs with spectral linewidths less than 1 nm and a controllable spectral separation of up to 23% of the short resonance wavelength are presented using rectangular-grid grating GMR structures. Three-line filters are designed in hexagonal-grid grating GMR structures with two independently controllable resonance locations.

Experimental Evidence for Coherent Perfect Absorption in Guided-Mode Resonant Silicon Films

“…Simple GMR structures comprising a single 1-D periodic layer have been used to create filters, polarizers, and polarization-independent devices with applications in biosensing, communications, and solar cell enhancement [18]- [20]. Similarly, the GMR concept can easily be adapted into 2-D structures to offer further advantages in each of these applications [21]- [23]. To achieve coherent perfect absorption within a GMR device it is necessary to implement interaction of multiple coherent beams entering the device.…”

Finite-Difference Frequency-Domain Algorithm for Modeling Electromagnetic Scattering From General Anisotropic Objects

“…GMR devices using ruled gratings are inherently sensitive to polarization due to the birefringence imposed by the grating [32][33][34][35][36]. By incorporating anisotropy into the design, it becomes possible to introduce birefringence that counteracts the grating to realize polarization independent designs.…”

Deposited nanorod films for photonic crystal biosensor applications

“…[3][4][5][6][7][8][9][10][11][12][13][14] Comprised of a subwavelength modulation in RI, such structures can produce complete exchange of energy between forward-and backward-propagating diffracted waves with smooth line shapes and arbitrarily low line widths. 5-7 PC structures displaying guided-mode resonances ͑GMRs͒ have been successfully used to develop optical filters, 15-18 polarizers, 6,19 light modulators, 20 wavelength-division multiplexing devices, 21 vertically emitting lasers, 22 light-emitting diodes with improved extraction efficiency, 23-25 optical nanoelectromechanical transducers, 26,27 humidity sensors, 28 labelfree biosensors, 29-32 enhanced-fluorescence biosensors, [33][34][35][36][37] and substrates for surface-enhanced Raman spectroscopy.…”