In this study we will design photonic structures whose spectral properties are particularly sensitive to the environmental modifications, and we will present measurement system that allows to detect these small variations. For this purpose, we will focus on the phase at the reflection on periodic structures, in particular for the critical coupling points for which the phase variation is abrupt. The measurement method that we develop consists in an original holographic interferometric setup based on wavefront shaping that allow a very stable phase measurement.The fabrication of a temperature sensor based on these two principles has allowed us to experimentally reach phase sensitivities up to 39°/°C.
Tamm plasmons are electromagnetic states located at the interface between a dielectric Bragg mirror and a metal [1]. Contrary to conventional surface plasmons, Tamm plasmons can exist in both TE and TM polarization and its parabolic dispersion lies above the light cone which allow a direct optical excitation at normal incidence. Besides, the Tamm mode confinement can be obtained by simply patterning the thin metallic film, such as microdisks [2,3] or microrectangles [4]. Here, we aim at obtaining ultimate confinement using photonic crystal periodic structures in the metallic layer.
The samples are constituted by a DBR with 4 pairs of l/4n layers of Si and SiO2 above which periodic metallic patterns are defined using e-beam lithography and a 50nm gold deposition. Lift-off is performed at the end of the process. The period of the gratings is chosen to obtain a Tamm Bloch mode around 1.3micrometer.
Microreflectivity experiments show that Tamm Bloch modes exist in such 1D periodic structures. Using an original design, we create a 1D photonic band gap as large as 140nm. Finally, we will present experimental results on cavity-confined Tamm Bloch modes. All results are in good agreement with numerical calculations.
[1] M. Kaliteevski et al., Phys. Rev. B 76, 165415 (2007)
[2] O. Gazzano et al., Phys. Rev. Lett. 107, 247402 (2011)
[3] C. Symonds et al., Nanoletters, 13 (7), pp 3179–3184 (2013)
[4] G. Lheureux et al., ACS Photonics 2 (7), pp 842–848 (2015)
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.