Profile

Ph.D. in physics from ETH Zürich, Switzerland, on "K_1-yNa_yTa_1-xNb_xO₃ Thin Films for Integrated Electro-Optics"

Fields of interest

• optics in epitaxial perovskite thin films
• low-temperature behavior of electro-optic and dielectric coefficients in ferroelectrics
• optical microresonators as filters and modulators
• software simulation of waveguide modes

Publications

• C. Herzog, "K_1-yNa_yTa_1-xNb_xO₃ Thin Films for Integrated Electro-Optics" Ph.D. Thesis (2007) - PDF (hyperref links) - PDF (DIN A5 booklet)
• C. Herzog, "K_1-yNa_yTa_1-xNb_xO₃ Thin Films for Integrated Electro-Optics" Ph.D. Talk (2007) - Flash presentation
• C. Herzog, S. Aravazhi, A. Guarino, A. Schneider, G. Poberaj, and P. Günter, "Epitaxial K_1xNa_xTa_0.66Nb_0.34O₃ thin films for optical waveguiding applications", JOSA B Vol. 24, No. 4 (2007)
• C. Herzog, S. Reidt, G. Poberaj, and P. Günter, "Electro-optic phase modulation in ridge waveguides of epitaxial K_0.95Na_0.05Ta_0.71Nb_0.29O₃ thin films", Optics Express 15, 7642-7652 (2007)
• C. Herzog, G. Poberaj and P. Günter, "Electro-optic behavior of lithium niobate at cryogenic temperatures", Optics Communications 281 (2008) 793-796
• D. Rezzonico, A. Guarino, C. Herzog, M. Jazbinsek and P. Günter, "High-Finesse Laterally Coupled Organic-Inorganic Hybrid Polymer Microring Resonators for VLSI Photonics", IEEE Photonics Technology Letters 18 (7), 865-867 (2006)
• A. Guarino, M. Jazbinsek, C. Herzog, R. Degl'Innocenti, G. Poberaj and P. Günter, "Optical Waveguides in Sn₂P₂S₆ by Low Fluence MeV He+ Ion Implantation", Optics Express 14 (6), 2344-2358 (2006)
• L. Mutter, M. Jazbinsek, C. Herzog, and P. Günter, "Electro-optic and nonlinear optical properties of ion implanted waveguides in organic crystals", Optics Express 16 (2), 731-739 (2008)
• D. Lange, C. Hagleitner, C. Herzog, O. Brand, and H. Baltes, "Magnetic Actuation and MOS-Transistor Sensing Scheme for CMOS-Integrated Resonators", Techn. Digest IEEE Micro Electro Mechanical Systems (MEMS) '02, 304-307 (2002)
• C. Herzog, "A Single-Chip Micro-Nose", Diploma Thesis (2001) - PDF
• C. Herzog, "A Single-Chip Micro-Nose", Diploma Talk (2001) - PDF

Using the serial output of a PeakTech 4010 multimeter

The Peaktech 4010 is a nice 4½ digits tabletop multimeter at a very reasonable price (EUR 200.-). It also sports a RS232 serial output which makes it interesting for lab use. The device is shipped with a Windows software that can read the measurement values and plot graphs etc, but it is not suitable if you want to integrate the multimeter into some computer controlled measurement setup. Even though the protocol is described in the manual, we had great difficulties reading the data in either LabView, C or a terminal program like minicom. After some fiddling with the oscilloscope, we found the solution: the 4010 only accepts "send data" commands if DTR is positive on the serial line, while RTS is negative. Any RS232 capable program we found sets RTS to +12 V, and thus the multimeter does not react. The solution to this problem is to set the UART to pull the RTS line to -12 V. In C, this can be accomplished with the following code snipplet:

#include <termios.h>
#include <sys/ioctl.h>

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

int main() {
	int i, serial;
	if ((serial = open("/dev/ttyS0", O_RDONLY))<0) {
		fprintf(stderr, "couldn't open serial port!");
		exit(1);
	}
	i = TIOCM_RTS;
	ioctl(serial, TIOCMBIC, &i);
}

In LabView, you can use the following setup. The yellow thing is a "property node". NI has a knowledgebase entry on this topic at this URL. Good luck!