Photonic crystal is regarded as the counterpart of the electronic crystal in the field of optics

many concepts of the solid state physics are introduced into the photonic crystal

such as reciprocal lattice vector

Brillouin zone and energy band structure

etc

. People can understand the operating principle of photonic crystal through researching electronic crystal. Back in the seventies of the 20th century

with the gradual minia-turization of semiconductor devices

the concepts of quantum well and superlattice were introduced in semiconductor materials. People are excited to make photon quantum well and superlattice through imitating the semiconductor quantum well because of the numerous similarities between the photonic crystal and the semicon-ductor

much progress has been made both in experiment and in theory

quantum well structures are realized in one-dimension

two-dimension and three-dimension photonic crystal

the phenomenon of optical quantum well similar to semiconductor quantum well is observed

the quantized photon levels emerge from the transmission spectrum. The observable information of optical spectrum includes frequency and intensity. Traditionally

restricted by the complexity of the spectral intensity and the precision of data processing

the majority research of the spectrum is concentrated on frequency. With the improvement of the experiment condition and the continuous optimization of algorithm as well as the advancement of the calculation conditions

the research on spectrum intensity is becoming more and more important. In order to gain the accurate spectral intensity absolute value

people are always searching for a simple detection method which can reflect the spectrum structure truthfully. Essentially

the calculation of the spectrum intensity is a problem of quantum mechanics. Although the quantum mechanics describes the existence of the microscopic material by the expression of probability

according to the Einstein light quantum supposition

we can also research the light wave by decompounding it into single photon. The light wave is the macroscopic ensemble average of the photon particles

while photon is the micro-quantization of the light wave. In the photon quantum well structure

the spectrum intensity is proportion to the number of the photons which tunnel through the photonic wells. The larger the number is

the stronger the tunneling spectrum intensity is; the more concentrated the light beam is

the higher the efficiency is. It is more suitable to produce the laser source

photoelectric detector

optical switch and many other optical communication devices. The relative studies are more tempting and have great application prospect. The quantized energy states of photonic crystal quantum-well are discussed by finite-difference time-domain method(FDTD). The results show that for the closed photonic quantum-well the number of resonant transmission peaks is equal to that of open quantum-well's

the positions are almost unchanging

but for the closed photonic quantum-well

its extractive light intensity is obviously stronger

the transmissivity is higher

the frequency selectivity is better and the quality factor

Q

is higher. Simultaneously the optical field distributions in both quantum-well structures are obtained

it is shown that the open quantum-wells are traveling-wave wells while the close quantum-wells are standing-wave wells

which has firmly confirmed the proposal that closed photonic quantum-wells could bound optical field better

the physical mechanics which results in these conclusions are discussed. The research in this area is rarely seen.