**8. References**

Aoki K., Vittorio M., Stomeo T., Pisanello F.,Massaro A., Martiradonna L., Sabella S., Rinaldi R., Arakawa Y., Cingolani R., Pompa, P., (2009), EP 09166989.5-1234. Bodovitz, S., Joos, T., & Bachmann, *J. DDT*, Vol. 10, (2005), No. 4, pp. 283.

Fig. 18. Cavity mode profiles of modes indicated in Fig. 17: (a) mode 0.9; (b) mode 2.9; (c)

Examples of photonic crystal waveguides and bio-sensors are presented. The main goal of the proposed chapter is to provide information about methods and approaches of biosensing systems. In the first part of the chapter we focus on the in-plane coupling of a light source by analyzing different tapered waveguide profiles able to couple W1 photonic crystals. Then we analyze different bio-sensors such as DNA sensor chip and PhC Si3N4 membrane, by discussing the irradiation and diffraction properties. In the last part we

The author would like to appreciate the NNL, Istituto di Nanoscienze - CNR for the support

Aoki K., Vittorio M., Stomeo T., Pisanello F.,Massaro A., Martiradonna L., Sabella S., Rinaldi R., Arakawa Y., Cingolani R., Pompa, P., (2009), EP 09166989.5-1234.

Bodovitz, S., Joos, T., & Bachmann, *J. DDT*, Vol. 10, (2005), No. 4, pp. 283.

provide design criteria of a bio-compatible polymeric PhC.

mode 11.9; (d) mode 14. 9.

**7. Acknowledgment** 

**8. References** 

received during my past research activity.

**6. Conclusion** 


**7** 

*China* 

**EIT-Based Photonic Crystals** 

*Zijingang Campus, Zhejiang University, Hangzhou* 

*Chung Hua University, Hsinchu, Taiwan* 

*Modern Optical Instrumentations,* 

**and Photonic Logic Gate Design** 

*1Ph. D. Program in Engineering Science, College of Engineering* 

Teh-Chau Liau1, Jin-Jei Wu2, Jian Qi Shen3 and Tzong-Jer Yang2

*3Centre for Optical and Electromagnetic Research, State Key Laboratory of* 

*2Department of Electrical Engineering, Chung Hua University, Hsinchu, Taiwan* 

Over the past two decades, the effects of atomic phase coherence have exhibited a number of physically interesting phenomena such as electromagnetically induced transparency (EIT) (Harris, 1997) and the effects that are relevant to EIT, including light amplification without inversion (Cohen & Berman, 1997), spontaneous emission cancellation (Zhu & Scully, 1996), multi-photon population trapping (Champenois et al., 2006), coherent phase control (Zheltikov, 2006; Gandman et al., 2007) as well as photonic resonant lefthanded media (Krowne & Shen, 2009). EIT is such a quantum optical phenomenon that if one resonant laser beam propagates in a medium (e.g., an atomic vapor or a semiconductor-quantum-dot material), the beam will get absorbed; but if two resonant laser beams instead propagate inside the same medium, neither would be absorbed. Thus the opaque medium becomes a transparent one. Such an interesting optical behavior would lead to many applications, e.g., designs of new photonic and quantum optical devices. Since it can exhibit many intriguing optical properties and effects, EIT has attracted extensive attentions of a large number of researchers in a variety of areas of optics, atomic physics and condensed state physics (Harris, 1997), and this enables physicists to achieve new novel theoretical and experimental results. For example, some unusual physical effects associated with EIT include the ultraslow light pulse propagation, the superluminal light propagation, and the light storage in atomic vapors (Schmidt & Imamoğlu, 1996; Wang et al., 2000; Arve, 2004; Shen et al., 2004), some of which are expected to be beneficial (and powerful) for developing new technologies in

In this chapter, we shall consider a new application of EIT, i.e., EIT-based artificial periodic dielectric: specifically, the EIT medium (an atomic vapor or a semiconductor-quantum-dot material) is embedded in a periodic host dielectric (e.g., GaAs). As is well known, the photonic crystals, which are periodic arrangements of dielectrics, have captured wide attention in physics, materials science and other relevant fields (e.g., information science)

**1. Introduction** 

quantum optics and photonics.

